I do like differences in my duck decoys, not too worried about in the geese. The differfent positions take care of that with a goose spread. I agree with DSM as to running the same brands, simply alot easier in the am. You see /hear of alot of guys selling out and going with a different brand. I think they simply look better to them, not so much to the goose.
You can always add to your spread with a few different head positions, like adding a Bull or two. Size also.... add a lesser or three. But, over all, a single brand with all the head position/poses offered will kill all the geese you want to clean