In VR headset world today, we have two options to decide before beginning the journey of VR adventure. The first, PC-based headsets such as Oculus Rift, HTC Vive, Sony PlayStation VR come with PC and power supply. This kind of headset needs a budget at least 1000-2000$ for total equipment. Another choice is phone-based headsets such as Samsung Gear VR, Google Cardboard, VR Coolcold, VR Box... This choice is cheaper than because you have had your own phone and you need to buy a cheap headset only 15$ for enjoying Virtual Reality.


Here is a list of top vr headset which you should  know before decide to buy any vr headset. Because buying a good and suitable one is not easy for the newbie :) in VR world.
1. Oculus Rift
Official page: https://www.oculus.com/
Release day: March 16, 2016
Main features: The Rift offers a 2160 x 1200 resolution, across the two OLED displays on board, ~ 110° field of view, working at 233 million pixels per second with a 90Hz refresh rate. The Rift also have an optical sensor (camera) for positional tracking (5 x 11 feet).
Platform: Windows PC + Oculus home with CPU (i5-4590) and VGA(NVIDIA GTX 970 / AMD R9 290) with minimum 8GB Ram.
Price: 599$ https://shop.oculus.com/en-us/cart/
Commercial Ads of Oculus Rift:

See more Oculus Rift compare to Samsung Gear VR

2. HTC Vive:
Official page: https://www.htcvive.com/us/
Release day: April 5, 2016
Main features: The HTC Vive offers a 2160 x 1200 resolution, across the two OLED displays on board, ~ 110° field of view, working at 233 million pixels per second with a 90Hz refresh rate. The HTC Vive also have an optical sensor (camera) for positional tracking (15 x 15 feet)
Platform: Windows PC + SteamVR with CPU (i5-4590) and VGA(NVIDIA GTX 970 / AMD R9 280) with minimum 4GB Ram.
Price: 799,99$
Commercial Ads of HTC Vive: 
Video play game on HTC Vive in Vietnam:
Video unbox HTC Vive in Vietnam: 

See more HTC Vive compare to Oculus Rift

3. PlayStation VR Headset:
Official page: https://www.playstation.com/en-us/explore/playstation-vr/
Release day: October 13, 2016
Main features: The PlayStation VR Headset offers 5.7-inch 1080p OLED display, 100-degree field of view with 120Hz refresh rate. The PlayStation VR Headset also have an optical sensor (camera) for positional tracking.
Platform: PlayStation 4.
Price: 399$ https://www.playstation.com/en-us/explore/playstation-vr/pre-order/
Commercial Ads of PlayStation VR Headset

4. Samsung Gear VR
Official page: http://www.samsung.com/global/galaxy/wearables/gear-vr/
Release day: November 15, 2015.
Features: The Samsung gear vr offers Supper OLED display (1440 x 1280 per eye ) based on a smartphone, 90-degree field of view with 60Hz refresh rate. The Samsung gear VR doesn't have an optical sensor (camera) for positional tracking.
Platform: Android + Oculus home based on Samsung flagship phones.
Commercial Ads of Samsung gear vr:
Price: 99$ for new device (link)
70$ for old device (Link nhattao) (xem chotot)

5. ZEISS VR ONE Plus
Official page: http://vrone.us/
Release day: August 22, 2016.
Features: The Zeiss VR One Plus offers any dimension display based on smartphone, 100-degree field of view with 45 - 60Hz refresh rate based on your smartphone.The Zeiss VR One Plus doesn't have an optical sensor (camera) for positional tracking.
Platform: Android + Google Cardboard app.
Price: 129$ for new device (link)
Commercial Ads of Zeiss VR One Plus:

See more another headset from French, Homido device

6. Google Cardboard v2:
Official page: https://vr.google.com/cardboard/get-cardboard/
Release day: May 18, 2014 for version 01 and May 18, 2015 for version 02.
Feature: The Google cardboard v2 offers any display for 3 - 6 inch of smartphones, 100-degree field of view with 45 - 60Hz refresh rate. Google cardboard v2  doesn't have an optical sensor (camera) for positional tracking and only have one enter button.
Platform: Android based on flagship smartphones
Price: 15$ order on http://www.imcardboard.com
350.000 vnđ order on lazada.vn: http://bit.ly/29Gnu9A  
Commercial ads of Google Cardboard:

Ready for VR (phone size fits version 1 cardboard)*:
Apple iPhone 4, 4S, 5, 5S, 5C + 5S, 6, 6S
Google Nexus 4, 5, 5X
HTC Eco 3D, One (Mini, S, X, X+, E8, M8, M8S, M9, A9), Sensation, Sensation XE, Velocity 4G, Desire 320 (600, 610, 620, Eye)
Huawei Ascend G 615, P1, P6
iOcean X7
LG G2, Optimus 3D Max (P720), Optimus 4X HD (P880), Optimus G (E975), Optimus G Pro + P940 Prada 3
Samsung Active S, Galaxy (Beam, S2, S3, S3 Mini), S4 (Active, Mini), S5 (Mini, Neo), S6 (Mini, Edge), Note 3 Neo, S7, S7 Edge
Sony Xperia S, SP, T, Z, ZL, ZR, Z1, Z2, Z3, Z4, Z3+, Z5
Wiko Highway
Vodafone Smart 4 (Power, Turbo), Smart Prime 6
OnePlus X
Xiaomi Mi (3, 4, 4i), Redmi Prime (2, 3)

Ready for VR (phone size fits version 2 cardboard)*:
Apple iPhone 6 Plus, 6S Plus
Google Nexus 6, 6P
HTC One MAX, Desire 816 (816G, 820, 826)
Huawei Ascend Mate 7, Honor 4x, Honor 6 Plus, Mate 8
LG G3, G4
Samsung Galaxy Note 4, Note Edge, S6 Edge+
Vodafone Smart 4 Max (990N), Smart Ultra 6
Sony Xperia Z5 Premium
OnePlus One, 2
Xiaomi Mi Note, Redmi Note 2, Redmi Note 3

Via ZAAK for list compatible smartphone with Google Cardboard.

7. VR Coolcold
Commercial page: http://bit.ly/29HFlvl
Feature: Watch 360 video on youtube app, video 3D, high quality glasses.
Platform: Android + Google cardboard app based on flagship smartphone.
Watch video hand on 3DVRGlasses Coolcold:

8. VR Box 2
Commercial page: http://bit.ly/29IwvN0
Release day: October 13, 2015
Main features: VR Box v2 offers any display for 3 - 6 inch of smartphones, 90-degree field of view with 45 - 60Hz refresh rate. VR Box 2  doesn't have an optical sensor (camera) for positional tracking and only have bluetooth controller to play in game.
Platform: Android+ Google Cardboard app.
Price: 13.8 - 15.68$ (http://bit.ly/29IwvN0)
Video unboxing of VR Box 2:

9. Microsoft HoloLens
Commercial page: microsoft.com/microsoft-hololens
Release day: March 30, 2016
Main features: Microsoft Hololens's using Kinect-style tech to recognise gestures and voice commands, the headset has a 120-degree field of vision on both axes, and is capable of 'high definition' visuals, but it's still a letterbox compared to the likes of Oculus and Vive. More importantly, however, Microsoft Hololens is no connection to a PC – a full Windows 10 system is built into the headset and runs off a battery
Platform: Window 10.
Price: 3000$ (http://bit.ly/29IwvN0)
Video introducing Microsoft Hololens:
 

For getting good-quality experiences on Smartphone, you should check a list high-definition smartphone displays on Wikipedia to choose which Smartphone will be good for VR : http://bit.ly/29GmVfH.

Conclusion:
Virtual Reality will soon become the future of Digital World and real world in your life. So you should get your own headset to capture the trend of VR.