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I guess it comes down to how often you remove your wheels, and how easy you'd like that to be.
how so?
wheel removal is the same with sliding drop outs as with normal + ebb.
Effects on geometry are minuscule and moot in both examples.
I'd guess it comes down to how you want to do your chain tension adjustment.
Or rather; as that's probably quite easy both ways, it must be an aesthetic matter only.
Which replaced by adjusting saddle position and stem length
Luckily the latter are barely noticeably with a long brake hood.