I would call Minitab the “Cadillac” of stats packages. It’s got the most robust set of tools and I personally like it’s graphics the best. That said, I use SigmaXL and QI-Macros more frequently because:
- I switched to a Mac and can no longer use Minitab
- Many of my clients have budget constraints and those two have lower price tags.
I’ve also used SPC XL which is good. If I were you I would download a trial package of each of them to see which one seems more intuitive to you and which one fits your budget. I hope that helps!