Haven't owned either one. Have had some experience with the Sigma that belonged to a friend. Not a bad gun, just not one I would buy. My preference is the .45. I plan to look at the 24/7. I have heard a lot of good things about it. Doubt that any of them will replace my 1911s, but I like all types of guns. Might be fun to give the 24/7 a try. It's my understanding that it is more compact than the Sigms-------not really sure. If it's as big as the Sigma I'd have to pass on both.
Savage