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@fc9k
42mm is industry standard. It might not be better, but as its standard theres more bits out there made to fit to it.
No reason to go with the crowd though, do whatever you feel is best. My approach to chainline has always been to put it together and if it's not right fiddle with it until it is. So far everything's worked (more through luck than judgement), but I'm sure one day I'll build something up and it'll all be on the piss and then I'll actually have to put some thought into BB lengths etc :/