Once you are in the air it is mostly a matter of visibility -- looking down from a high-wing is more revealing than trying to see around a wing mounted low. However, looking for traffic at or higher than your altitude is enhanced in a low-wing. High-wings can be a little claustrophobic as you are constantly craning your neck to look around.

I have only flown a low-wing once but I have read and been told that some of the low-wings will actually "cushion" the landing flare a bit because of ground effect being more pronounced with a wing lower to the terrain. This may also cause an unexpected floating down the runway when the pilot is trying to land.

I'm looking at buying a piece of a little low-wing (Beech Musketeer) so I may have some hands-on observations re: high vs. low...

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W108M117(1972) repaired after deer hit
W124M103(1987)
W124M103(1989) -- sold to son's friend
W124M119(1993) --
W124M103(1987 -- 5 speed Euro) - sold to forum member
W124M103(1989) -- TE
W123OM616(1977)
W201M103(1990) parts car