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I’m with Farkas, it’s mostly a matter of finding the right tools for the job. There are differences in quality, but that’s also a matter of personal preference. Take the panel: some builders use sturdy aluminium, others FR4 / plastic. The same counts for the chips, the pots, etc. But most top quality brands are twice as expensive as their alternatives, and pretty HP heavy. I’m afraid you’ll have to do your research for every module. And you’ll probably still have some surprises: not all modules play as well with modules from other brands. Eurorack is a bit of a wild west situation..
And about noise: don’t underestimate the importance of a good power supply! A power conditioner in the studio can also help.