Take a bow @GG_2024 for navigating your son not just through an academic journey that resulted in this many merit-added admits but possessing the willingness to manage the application landscape for all these schools. Nicely done. 
If you’re Maryland in-state, you may want to find the time for a Richmond daytrip. $25k is a really nice deal there. Jugging twins heading into college isn’t cheap for anyone. My guess is that 'Bama gives you what U_SC offers for 1/2 the price. UMD hasn’t been an easy admit for many in recent years. FSU made you a nice offer as well. I think it’s down to those four.
My strongest recommendation would be to go see Richmond soon as you two get a chance.