Mama Della's is awesome and so is Portofino (PBH). We stayed there for three days in February and we ate dinner at Mama's twice. We're originally from NY, so we have had some really good Italian. Mama's is up there with some of NY's best. The atmosphere is great. They have a woman play Mama and she comes around to all the tables to chat. Each "room" is set up like a room in an Italian house. We really liked Dad's room.
The rest of Portofino is great as well. Lots of areas to explore. My kids really enjoyed the "castle" pool (zero entry with a beach area, nice long slide through the castle, etc.).
If I had a choice, I would do Mama's and explore PBH a while, then head to Citywalk for some clubbing.