@Kevin4fm
I use both the sites for the reasons you mention, and others.
GEVI is better if you know a co-stars name, as you said. It also sometimes has photos from the scenes (especially for multi-scene videos), which iafd does not. And both are incomplete (run by volunteers). GEVI seems to add recent releases more quickly, at least lately.
iafd has straight porn also; GEVI is gay only.