This or OBS SoftwareI use Action! by mirillis. It's pretty good and isn't intensive at all, I can record every game I play on 60 stable FPS which is something I wasn't able to do with other recording software.
Before that, I also used Bandicam which is also pretty good if you can get the settings right (it isn't too complicated).
Then, I would say Mirrillis Action (or however you spell it )OBS software has a lot of issues with capturing gameplay. I have had a few videos I had to just scrap cause of video f**k ups I was post-recording