I did a massive detailed analysis on a spreadsheet! I compared SLR, POVR and VRporn
POVR doesnt offer a lifetime subscription, and tons of good studios seem to have bailed out on them during 2021 : from memory it was Badoink, 18VR, VRBangers, VRConk. I also am not a fan of their milfVR scenes which by definition all seem to have fake boobs, leaving me to muddle through with wankz and their POVoriginals
VRPorn is inexpensive, but they dont have a very good way to manage favorites - you basically have one playlist called "favorites". There is also no "forum"
SLR offers a lifetime membership, has a forum and playlists, has the SLR app which works great and is much better than a website. It has all the studios that VRPorn has. SLRoriginals is chock full of beautiful content, and then there is the absolute ocean of JAV content, if you are able to enjoy it in spite of the pixellation.
So, basically I am a lifetime SLR member and there is so much new content every day, its hard to even go back and revisit old favorites. The only drawback of all of these sites is that a studio can pull all of their content at the drop of a hat