What is everyone's preference for screen recording software? Tried a few free one's that couldn't keep up with recording games, looked into Fraps, but having problems with the video output files. Curious to know what you guys are using!

Bandicam

OBS or XSplit

Fraps worked fine for me, no problems, for games.
For desktop recording I've heard Camtasia is good.

The funny thing is the free version worked for me, but once I bought the full version it would just output black video files that crash my movie makers and movie players. Their support hasn't got back to me.

I use Bandicam or Fraps.
Actually Fraps needs less resources than Bandicam, but generates extremely large video files. It's because Bandicam compress video while Fraps outputs raw.