In a moment of weakness, I once swapped a P-220 with the European magazine release for a NIB .40 High-Power Combat. I wish I had that 220 back. I'm never really sure what "better" means in the context we use it. Sig went to the milled slides on the 229 from the folded slides on the 228 because they needed a beefier slide to handle the .40 S&W and the .357 Sig. Is a beefier slide better or worse? Is stainless better or worse? I tend to see these things strictly in terms of how the change effects functioning. My current 226 runs exaclty like my first 226 back in the mid-1980s...with boring regularity. It shoots the same, handles the same and seems to me to be less prone to rust than my old 226, which had been beaten pretty badly. Better...worse...shrug...
I can't for the life of me figure out why people occasionally get so torqued up over some of this stuff. I do like for my guns to work all the time and not ave parts fly off into space, but there are lots of different ways to accomplish that goal. I've had various people explain to me in excruciatng detail why MIM, cast, forged, milled, alloy, polymer, etc. parts all suck or are all the greatest thing since sliced bread. In reality, it's all a question of appropriate technology. All parts fail under enough useage. The trick is to use the right technology in the right spot.
BTW, I'm anticipating swapping my German P-225 for a P-250 9mm, because I really liked the way the 250 shot.
Michael B