Does Pump Type, Pump Size or the Amount of Pumps Matter?

I want a spa which is powerful enough to give me a vibrant massage as I suffer from back pain. How many pumps should I be looking for or is there anything else that comes into play to determine how powerful the jets are?Are more pumps better than less pumps? How many jets can 1 pump power sufficiently? Does pump size matter? Does the type of jets matter

A. HORSEPOWER CLAIMS ON HOT TUBS AND SPAS The BISHTA Committee has recently discussed the confusion in the marketplace over horsepower claims for pumps on hot tubs. While the industry norm is around 2hp, claims of ratings up to as much as 10hp can be found on some manufacturers' literature, with the implication for the customer that higher ratings must be better. The BISHTA Committee is aware that these claims and the literature that contains them originates from America and is expressed on a different basis from UK practice, and has urged all members to prepare their own explanatory material to interpret these figures in commonly understood terms.