In the past year I've tried basically every studio, here are my recommendations
Lifetime recommended:
-SLR (DeoVR):
Best streaming service/platform, varied and lots of content which is easy to navigate
-VRBangers (Heresphere downloaded):
Best quality right now, great casting. PlayaVR sucks, downloading is best
-WankzVR/MilfVR/POVR (Heresphere, works in DeoVR but limited):
Great quality/casting, excellent streaming via Heresphere
Others, if you're interested in enough videos, get 1 month and download favs:
-CzechVR (Heresphere):
Best camera angles, great quality but a lot of the casting is hit or miss for me
-Badoink/VRCosplayX (Heresphere):
Very formulaic, kind of boring, good but not great quality
-KinkVR (Heresphere):
The only 'proper' hardcore/BDSM site who do it very well
Worst male actors in the industry
-NaughtyAmerica (Heresphere):
They've been having quality issues lately
Big collection, usually good quality, I wouldn't bother too much with sub-6K
Personal fav: RealPornstarsVR series
-VirtualTaboo/DarkroomVR (no HD streaming I believe?):
Same casting as CzechVR
If you like taboo I guess its good, not my thing
-Swallowbay (not sure which platform/if streaming is available):
If you don't have their collection from SLR, and like deepthroat, I recommend it
Most inconsistent studio in the business, will their next release be 2, 3 or 4+ weeks apart? You'll never know
Not recommended:
Virtualporn + WetVR
Don't bother with these
SLR hands down ... JAV and solo content are my favorites.