I know very little about swimming pools, considerably more about pumps & motors and have ALOT of opinions!! US Motors (industrial NEMA frame type) has a long history of reliability as do others such as Baldor, Reliance Electric, GE, etc. There's very little reliability difference between these manufacturer's motors and PRICE is the deciding factor. I am unfamiliar with AO Smith motors.
US motor offers this 18-month warranty (+ replacement seal) which is good but I expect years of service (not months) from my pump motor. I am troubled that the motor "need bearings ALOT". This should not happen and curious what's causing the bearing failures and the frequency between these failures. If the pump problem, such as cavitation or alignment, contributing to motor failure is resloved then motor life is considerably extended and the price delta between any two motors is diminished...just my 2 cents
Good luck with your choice
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