WinRAR in my experience has a better speed/compression ratio than 7Zip. If you need best compression 7z is probably best but it will cost you some extra time. T

WinRAR in my experience has a better speed/compression ratio than 7Zip. If you need best compression 7z is probably best but it will cost you some extra time. The GUI and integration of 7Zip also aren't as polished as WinRAR's. I've been using both since their early versions and each have their individual strengths.