Hi Pat,
Don't confuse/mix the HP and the 110/220. (voltage)
For the most part, the pumps are typically the same, regardless if the tub is 110 or 220. The thing to be aware of between 110 and 220 tubs is that a 220 will be able to run the pumps and run the heater at the same time. With a 110v tub, it's run the pumps or run the heater.
For what it's worth, choose your tub on the wet test rather than the HP and pumps. (Some manufactuers list "peak" HP, while others list it as "Brake"), The amount of jets, the type of jets and the plumopging can all make a difference in how the tub performs.