Congratulations on getting in and congrats on your hard work paying off!
MBB is a bet and not a guarantee at any program.
Based on my stake-in-the-ground valuation of a Top 10 MBA, the value is equally distributed if the price difference is indeed $100K, meaning it would not be a mistake to go with either one depending on a personal situation and preference. If you have a heavy burden of undergrad loans, I would highly recommend taking the scholarship and moving to UW.
If you are looking to add a strong brand name to your resume and be a part of a very close knit community with strong recruiting, and somewhat putting more value of having a better experience (rather than more economical one) then Foster won't compare with Fuqua.
If it is 100K difference, I think the choice is yours. Neither is better really. If the difference is less, then Fuqua is starting to look marginally better and vice versa.