I own both, and I love the MK25 but the undercut on the Legion is just right for me. You can not make a wrong move with either

If I was planning to get a new P226, I would opt for the P226 Combat. I've been wanting a GGI tuned Combat for a long time.

I own both. Both are great guns. If I had to choose it would be the Legion for the checkering and undercuts. Everything else you could probably frankengun to what you like. Checkering and undercuts are outside my strike zone.

Oh yea, it also comes with a challenge coin! (sarcasm)