i'll wait on the Floating Boarding Schools. pop + settler production
I already have 3 lvl 4 schools, and that's more than enough for now. I mean I sometimes have to throw in a quick to play adventure just to burn troops so I won't max out before the next time I'm online.
I would say it depends on how long have you been playing TSO and how is your island? For me floating anyday since it doesn't cost me any space ( real island space) and I could buy or make bread pretty easy so the settler production isn't that much needed ( 60 per day at level 5 without buff isn't much at all).