Had a Kohler Tea for Two jet tub which in 2014 remodel was replaced with a Bain Ultra Air tub. I think both are nice and noisy. The jets were stronger, though the air bubbles are strong too. I don't notice very cold bubbles from the air holes. Overall I prefer the range of controls of the Bain Ultra tub (timer, strength, auto dry, etc.), and the heated back, but maybe jetted tubs do that now too.
Q