Considering that you want to teach TESOL the study abroad elements would be very important - you’d be in Spain like your future students would be in the US. In addition, if you wanted to be K12 certified speaking Spanish fluently would definitely be a big bonus.
And yes Honors at UDel is a very nice perk - priority registration alone is worth its weight in gold (when your forensic at UF complain they’re stuck with online classes or all the bad TAs you’ll understand how Lucky you are that you can pick any section, any class, any professor).
It sounds like the cost differential isn’t too bad, so I’d pick UF.