The thing with OBS is that you can't select the area to record by drawing a box, like you can with fraps.Or can you?
if you have a nvidia card, shadowplay it's free and delivers high quality footage without affecting your speed
i use full version of fraps but it's really annoying
MSI Afterburner. I've tried OBS and Afterburner. Afterburner uses a lot less resources than OBS.Only thing to keep in mind is that it's more than just a recording software, so it can be a bit confusing at first.