We're doing a resort-only trip in March and SSR won out for us. This is why:
a) walking distance to Disney Springs for multiple dining options, bowling & movies, etc, as well as access to the Disney bus system to go to other resorts for dining/activities
b) four different pool options (2 with zero entry & slides, one with a splash pad, another horse-themed splash area)
c) proximity to Lynx bus system to go to SeaWorld one day
d) Golf course for husband/spa for myself
e) I don't want to hassle with a car rental on vacation (because it would require lugging down two car seats as well)
We rent a studio and have two young daughters, so them sharing a pull-out is not a big deal. Also, because we are renting a studio, we don't do a lot of cooking in the room, we go out to eat a lot, so access to dining at Disney Springs without having to use a boat to get there was also key for us.
Old Key West looks very nice and if we were doing a one-bedroom and cooking most of our meals, I might pick there due to the themeing, sandcastle pool, and larger rooms.