Wow, I am surprised to see the comments about the condition of the Seapointe units. I stayed there in August (2015) and I felt that with the exception of the kitchen cabinets (which are dated and should be replaced, imo) the units were quite nice. The units have been fully refurbished in the past two years. I do own there, so perhaps there is inherent bias, but I am a pretty critical person - just ask my husband!
I don't care if I own a unit there or rent, if it is icky I will say so. We own the largest B unit (both the living room and bedroom face the ocean). Maybe that's why my experience is different than others?
I haven't stayed at Marbrisa so I can't comment or compare the units.
With teens, I would prefer the location of Seapointe with it's proximity to the beach. Also there is a ping pong table, a foosball table and a pool table, plus a basketball court and tennis court. We also love the adult pool with it's great ocean view.