Homes
You aren't going to get the answer(s) you want from here, especially about UND. The only ones that post with any regularity are UND haters (just because it is UND), the school could offer free flight training and they would still complain.
Ask yourself a couple of questions:
1. How much do you want to spend? (out of state tuition is a killer at any college)
2. Do you want to fly on your schedule or on a fixed schedule?
3. Without college loans, how do you plan on financing your training
4. reference above question, how fast do you want to get your training dones.
5. Does Purdue or UND offer a degree program other than aviaiton that interests you?
5a. Do you already have a degree?
6. Would you want to work for Purdue or UND as a flight instructor after graduating
That is about all I can think of for pros or cons without knowing more specifics. Your flight training is entirely what you put into it, UND/Purdue will have much more to offer in the way of resources than most FBOs, but there is a more cost associated, but not much (I did all my ratings through MEI for around 30K at UND, not including tuition, but I also got a degree).
I have seen just as many Purdue grads get hired at regionals (assuming you want that) as UND/ERAU/Off the street FBO types, etc.
But honestly, unless you get someone who has gone to both schools or taught at both schools, or some combination, all you are really going to get are the ones who know how to complain in the virtual world.