Like others have said, I'd think really hard about what will matter to you in the long term. Does it have to do with non-school factors? Or does it just come down to differences between two programs? Will it really make a difference which school you go to? Is it a better "fit" you're worried about? Better opportunities in a particular department? A particular program you like? Or is it more of a nebulous, "that is my dream school" feeling?
True, you might always wonder "what if" in the event you end up miserable in the cheaper school. But it's just as likely to feel stupid ending up miserable in the more expensive school! It's really hard to predict how you'll like vet school beforehand, and quite honestly, I truly truly believe that no matter where you go, vet school will be what you make of it in all aspects of your vet student life. This even goes with opportunities that you think you're likely to find in a particular school. Maybe school A is known to have the strongest ophthamology department, and school B doesn't even have an ophthamologist on staff. That doesn't mean you can't find opportunities for yourself that will be just as amazing. And sometimes, even greater opportunities come when you make it for yourself and you can mold your own experiences rather than taking part of an established program. I'm not trying to push you either way. I mean, I personally picked a school that ended up being about the same amount over another for personal reasons. But in terms of how happy I would have been with the program itself had I attended the cheaper option, I don't think it would have made a difference. There's plenty to love and plenty to B**** about in aaaaany program. And trust me, the grass will always seem greener.
And as creepy as this is, I distinctly remembered there being a thread similar to this from my cycle... so I just spent like 20 min searching and fished it out.
This first thread was of one applicant who really wanted to go to her oos, but felt financially obligated to go to her is (and was initially really really bummed out about it).
Here's the followup from after she started her first-year. She hasn't been around here as of late, but maybe you can PM her and ask her how she feels with almost 2 years down?
But yeah... I'm not sure what waiting past April 16th will do for you. Maybe wait until that date for an epiphany, but if you haven't been compelled to put down a new deposit and burn the old by then, take it as a sign?