One of the HTC ones. Or WMR if you are cash strapped. Dont go with oculus stuff or you will be shackled to their platform.
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Well with Oculus, at least the Quest 2, it's just Android with different UI so I think it's the least shackled platform/hardware, as with the quest 2, you have PC vr with link cable and Standalone VR on the device itself with either games through the oculus store or... you can install apks on it so it's probably the most free platform