I like the slimmer lower profile look myself and on the low to medium power levels I don't notice much difference but when you start cranking the magnification up is when I see the difference and to me, the 50 is just a brighter scope on the higher power settings.
Tonight I mocked up a 50mm scope I had on the shelf that's going on a different gun and with the DIP Inc. rail and some low rings it wasn't to bad looking but it was borderline for me with regard to cheek weld. The scope was pretty low, maybe 1/4 inch off the barrel but the 527 doesn't have an overly tall comb height and I had to slightly lift up to get full view through the scope.
It's looking like I'll be going with the 3-15x42, no rail and the lowest rings I can use and still clear the barrel with the scope.