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As the stack is identical on both, I'd personally go for the longer of the two. It's generally better to shorten a mtb stem to accommodate reach than to lengthen it, as modern angles usually work better with shorter stems. ( No Euro-Pro look necessary here )
Only thing I'd watch out for is the standover, so measure your current bike's saddle-BB distance. Then work out how much exposed seatpost each size would leave you with, as you might want to install a dropper post later.
OK. So I am almost very close to hitting go with the Cotic Small.
However, I wanted to poll the hivemind, bearing in mind that I am not really an MTB-er, so I don't really know how forks or all the angles end up affecting reach.
Let's assume I go for a 120mm reach fork. At 5'5" I'm smack dab in the middle of XS and a S. Stacks are both the same. 11mm reach difference. Could this be easily compensated for by a shorter stem?
Is there something I'm missing here...