I would never crop a dog I wasn't going to show, but I think they look MUCH (usually) better. I hate it when an otherwise beautiful dog has a bad crop job. On the otherhand, I don't like docking. A lot more breeds than you would think have partially docked tails, ie
J/PRT
cockers
weimeranners
vizslas
GSP
GWP
Neapolitan Mastiffs
and so much more