Congratulations on your admits! I am amazed you have the time and energy to pursue professional development with a large family. I feel I have all but given up and I have just 2, though I tend to spend too much time here, so there is probably where all my time goes
Most FT programs do 3-4 classes in quarters which are 6 weeks long. Doing 1 class for 3 weeks is the same thing in terms of coverage and material you are getting. I personally prefer fewer distractions and would prefer a format that does one class at a time vs. 3-4 that are happening in parallel. Seems I can focus on one thing and nail it vs. worrying about multiple classes + work + family.
I think you do have some benefits with the online program and i hope it is not disrupted by the COVID19. Many EMBA and online programs have a meaningful in-person component that serves as an anchor and I hope it won't be dislodged here.
As to which program to choose, I feel you are somewhat committed to Fuqua with the connections you have established and it would potentially turn them off should you choose to head to Stern. On the MBA side, the schools are close, and some may even argue that Fuqua is a stronger player in several fields. I feel they are close.
P.S. Retaining information is often not the goal of the Programs but rather to teach you how to obtain information quickly and quickly process it. I would not worry too much about retaining a lot.
PPS. I would make sure you can capitalize on the degree and get tangible benefits in the short and long term. There are obviously intangible benefits of prestige, accomplishment, and confidence. But you are also paying $60-70K and if they are coming from your pocket, I would make sure your employer is going to commit to bumping your pay. I have had situations with my employer where informal promises were made that were not kept and it resulted in people feeling pretty crappy after doing an MBA for 3 years and ultimately leaving. The person who promised, could not keep their promise because of corporate regulations that prohibit people from getting greater than 20% pay raise even if they got bumped up a position or two. The reality is always more complicated but you want to make sure you backed by your bosses about this investment.