I will go against the grain here and recommend the Ruger #1. I own one in 458WM and love it. I have fired the 550 in 458WM and it was very nice too but I felt it was just too long. The Ruger is much more compact and the belt is no problem. The only problem with the Ruger is the case head hits the safety when ejecting. Nothing that a good file and a little time can't fix though.

It really boils down to intended use and personal preferance. In my case, the possibility of going to Africa is just a dream. No possibility whatsoever for the forseeable future so the #1 doesn't hinder me in the least. IMHO the #1 is a sexier rifle. I just like the way it looks more than the CZ. If I were going to hunt anything that could bite back, then my choice would most definately be different.