How serious are you? No question the more expensive target loads are more consistent and pattern better. Not much, but enough that all the serious competetive shooters use genuine target loads.
I shoot the cheapest thing WalMart has on sale at clay pigeons, and so far they have also been entirely adequate for doves. I have to save money for my $4 a shot duck loads ! (actually I avoided that fiasco this past season - I was abot to take the plunge and got quite lucky. Only $2.75 a shot, delivered.)
Oh, by the way, my older 1100s and Wingmaster digest all of them without the slightest whimper. Picking up empties, a lot of the silver Winchester heads are ripped, but they did eject.