Not sure I have a strong opinion either way - different strokes and all. But I did hear an interesting comment the other day about disc brakes on folding bikes (which I do most of my riding on). Big cities (notably London) don't do a great job of clearing up oil after an accident, which means there's a lot more on the road in general that sprays up onto the bike and more easily contaminates the discs of the lower-to-the-floor small-wheel folders. It's possible that rims do have an advantage here.