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If it wasn't for my bargain very nice wheels I would also go derailleur, not a big fan of the alfine. Felt nice for maybe two weeks after the rebuild. Now, not so much. Think the really long cable doesn't help.
Had to cut off the rack eyelet to make it fit. When you roll backwards with brakes on it moves and then needs a little tap so it rests against the stay again. Would not keep as is if I lived somewhere hilly, but has been solid for 2 years of daily short rides now.
I run a disc wheel with a questionable disc adapter on the back of my bakfiets. Not nice, fiddly, but works. And yes, 26 and wider is really good.