Which is the best clip recording software?

[I kill Bunnies]

Previously I got on OK with ReLive but I really struggled with it in the last month or so when it basically refused to record.

I am now have a Nvidia GPU but GeForce is already proving unreliable in recording clips.

Is there any good, reliable third party software that people here recommend?

 

[I kill Bunnies]

Thanks for the suggestions. The problem with Shadowplay is that not all of the replays save properly, despite the icon displaying to the contrary. It also fails to record eliminations despite being setup to do so.