I got my type at HPA and was thoroughly satisfied. Good training, good environment.
That being said, not sure how you are going to get a comparison, as I can't imagine how one person would have attended both places. (well, I can imagine, if they are rich and really have nothing on their hands but time and money and wanted to do nearly identical courses for the same outcome, 737 type)
So, not sure how you're gonna get a head to head. From the last 20 posts about type ratings, pretty much everyone that has been to HPA says good things and same with K&S. Some of the other type places get more mixed reviews (or are smaller thus have fewer proponents)
I have my doubts that any type school gets you an 'in' at SWA but I'm just a line pilot and don't know all the super secret "Herb only" info. I would pick on where you think you'll get the best training (i.e. best chance of passing a type ride w/o extra sim sessions or , lord forbid, a pink slip and a refly). A few years ago there seemed to be a sim school or two that did have reputations for having a fairly high percentage of their students require 'extra training.' That really cuts into the 'savings' of going with the cheaper sim school.
Good luck either way.