Great. Here's what you're getting between an M4 Max vs an AMD AI 395+:
https://imgur.com/a/yvpEpKFAnd of course, the Mac Studio itself is a much more capable box with things like Thunderbolt5, more ports, quieter, etc.
I can see why some people would choose the AMD solution. It runs x86, works well with Linux, can play DirectX games natively, and is much cheaper.
Meanwhile, the M4 Max performs significantly better, more efficient, likely much more quiet, runs macOS, more ports, better build quality, Apple backing and support.