There is no way to compare the SMCs' hazing frequencies because none of them release aggregated figures. In a lot of discussions on these boards you'll also see that what one person calls hazing, another might call intensive training. There was also an interesting white paper on USNA that came out in the 1990s that claimed people who are not fully bought-into a system (think early plebes/knobs/rats/doolies/swabs, etc.) are more likely to perceive something as hazing early in their path vs. later.
All SAs and SMCs expressly prohibit hazing in their regulations. Does it happen anyway? Sure it does. Remember also that you hear about the sensational cases - the woman chained to a urinal, the rat with a pool of lit lighter fluid in his palm - because they are sensational. My sense is, the SAs have fully adopted the idea that adversity trains, but hazing (humiliation, amplification of the power difference for no purpose) does not. The SMCs are more complicated; they answer only partly to DoD, but also their alumni and donors, and tradition is a mighty tower to move. The SMCs also vary in how DoD personnel oversee aspects of training new rooks, rats, and knobs. Ergo, because mostly-inexperienced upperclassmen may be responsible for some aspects of training, they may, from time to time, overdo the training.
So that's a long way of saying, it depends a lot on a lot of different variables, very few of which anyone is attending to. There's no real (evidence-based) answer to your question.