What's the best method? My trainer has all three- channels, weave-o-matics, and 2x2's. She prefers the 2x2s but said some methods work better for certain dogs. We tried the dogs today on the channels and then the 2x2s and the other two dogs definitely took better to the 2x2s so that was simple for them. Mia took right to both. Went right down the channel right away and was driving through the 2x2s at a slight angle already. When we trained before we were using guides but we never got very good so I'm just treating this as starting from scratch. So she told me to research and decide. Are there pros/cons to either?