I just yesterday wanted to see what kind of flight simulator games are available for Gear VR. So I went to Youtube, and searched for "Gear VR Flight Simulator". So, to answer your question, I use Youtube, to also see a review while looking for options, and I usually search by genre. I'm only interested in space games and flight simulators.
Working on LineWars VR: http://linewars.patrickaalto.com/LWVR.html