Have any of you folks ever trained with the guy who says: "My dogs won't pick up XYZ".... This can be Dokken DFT, Canvas, whatever.
I'm embarrassed for folks whose dogs will blink a bumper that's not theirs.
Most of us in training groups are going to encounter a time where their dog is going to run a long distance and see/smell someone else's bumper from someone else's truck for the first time. You want your dog to readily acknowledge that bumper and snatch it up.
In my opinion, regardless of what you prefer, I'd advise you to go ahead and give your dog exposure to several different types of bumpers. You don't want to be one of those guys that shows up at a training day and says "Hey, throw my dogs those XYZ's. He HATES ABC bumpers." Train your dogs to think a bumper's a bumper's a bumper.