Both are free so you can try each of them and benchmark them for yourself. If you're conscientious about streamlining and optimizing your system though, you may not get an appreciable benefit from either - in fact, they may cost you a frame or two since they add a background resource drain. See this:
http://www.howtogeek.com/171734/benchmarked-will-a-game-booster-improve-your-pc-gaming-performance/