I would stay at a "mom and pop flight school." I've flown with several people from a certain major flight school and bc of the experience of new vs old planes, or rushing through the requirements, I've found some of them to be scared of clouds and older airplanes that are serviced and maintained just fine. I'm not hating on them at all but imagine going to a 141 and having 2 months of great weather, never going through a cloud but taking your instrument checkride. In theory, you should be fine, but maybe you won't, you won't know until you're in it.