With geese, it is how they are raised, not the breed. If they are raised to respect you, they will behave. If they are raised like spoiled lap dogs, they can get very pushy since they think they have the right to act like overly spoiled children and you are supposed to do as they demand.
They are too smart and too big to be allowed to think they can do as they please. They must be raised with rules if they are to be well behaved.
I do not know if you will get show quality geese from Metzer. I know for a fact that it is not the place to purchase Blue Swedish ducks if you plan to show, but I am not familiar with their geese, other than to know that they are well cared for and well raised.
If you want to show, I suggest that you spend slightly more money and buy from a show breeder.
If you want Toulouse, Holderread is famous for his Giant Dewlap Toulouse. They are a good choice for showing: very showy, nice calm natures, very often big winners.
Really good Sebastopols are excellent for showing. They are eye catching. But they must be top quality if you want to show them. There are several really good breeders of Sebastopols on BYC.
I recommend Pomeranians for showing. They are very eye catching; the judge will notice them. My Poms are quite dignified, and other than feeding time, they are quiet.
All breeds of geese are loud when they set up an alarm, which they will do whenever they see anything unfamiliar.
Any breed of geese can win at shows if they are good enough quality. Flash birds are the easiest to show because they catch your eye. Good judges can also pick out top quality birds in the less flashy breeds.