Hi Leaf.
You sound as if you've done absolutely the right thing by drawing up a pro and con list of each place. From what you've written, at least the way it comes across to me, is you're trying your hardest to justify taking your top choice!
It might be worth asking roughly how many teaeching hours you are. From this do a "cost analysis", so work out how much you would earn and how much it would cost to live without the bursary at the first uni, then do the same with a bursary but with less hours at the second uni. In other words, you may find out that financially you get to a break even point.
And if you do choose the one with a bursary, make sure you aren't going to look back going "what if..." That's a tough one, believe me!