I think right now the Grandee takes the cake for jet pressure. As I've said before, the upgrade of the pumps with no addition of the BellaFontana makes it my favorite hot tub in the line for pressure. Envoy is probably second, then the Caspian/Vista. The Vanguard is a little bit more powerful than the others, but not by much. All the other models I'd say are fairly equal.
That's just my own personal observation, though. I don't think the Moto-Massage is stronger in any of the models, but when the other jets around it are stronger it kind of intensifies the whole thing.