I like this top 30 list, but some of the sites are free some are paid.
Anycase for me xHamster.com is best, I think it is largest, problem is that only 10-20% of videos are HQ. On the other side, sites I mentioned are all HQ (also 4D) but some of them are paid...
Of course, they are, and they are free, but they are too "general", for some specific type of porn in HQ various private productions gives better video quality. Just my 2 cents...
I like https://www.xcamsclub.com and pornhub.com. With both of them I can have everything I want and for free. Live chat and porn videos, what else can you want <><>