Sorry in advance for the wall of text...
LordCrash experience and a solid, believable performance are everything.
Ooh yeah, that's a solid point that I didn't think about. Having girls familiar with the "ins and outs" of VR shooting could definitely make a huge difference. Otherwise eyes looking at the stunt cock's eyes instead of the camera, etc etc etc,
I personally voted "both" in the survey, but I would imagine that there are a few reasons some dudes would want an amateur shoot. Usually when you think "amateur" on Pornhub (or wherever), it brings to mind authentic and genuine performances, as opposed to the over-the-top or over-acted performances that 75% of porn stars give off. Is there any reason to think the amateurs wouldn't copy this themselves knowing they're shooting a porn though? Not really...but there's always hope. Maybe the direction given to them is "look here" and the rest is left up to them.
Also for me personally, it might add a bit of "realism" to the scenario. When I put on the VR headset, I'm obviously going to enjoy whatever I'm viewing, but seeing a girl who I obviously know is an actress because I've seen her in 46 other VR porn scenes can be a bit of a downer. In the "dream scenario" of an amateur harem series, I'm accosted by 20 gorgeous girls who I've never seen before, as though I actually am the only dude to show up to the orgy/the male stripper at a bachelorette party/etc. Wishful thinking? For sure, but still helps a bit with the "believability" factor.
Lastly: irl every girl has her own style and takes things at her own pace, has her own preferences, etc. And to me that's one of the more enjoyable parts of sex. Having amateurs who each behave & react a bit differently and don't need to pretend to have orgasms after 20 seconds of dick-riding might be a breath of fresh air.
Of course I know all the above is 100% a dream scenario and seriously impractical to shoot in VR, but nevertheless...