all 3 a very good spa brands and great backing, they are all bout the same siza, the Hot Springs and the Jacuzzi use 24/7 circ pumps, more constant clean, were the Marquis uses the main pump low speed to filter 2 hours every 12, they use the in line spa frog system, i personnally have sold the inline frog system on my spas i do not like the bromine system it uses. all have great warranties. the questions you have to ask yourself is the comfort, easy to operate and maintain and knowing the total costs of wach on chemical maintenance in a year. and the comfort level you have with the dealers you are dealing with.....