Well, Cobia and Pampano are closest to the fitness center in the main complex. Kingfish has it's own pool, fitness center and bar but is seperated from the main complex by a big pink building.
IMO, there isn't a bad location at Ocean Pointe. This time of year the family traffic is down so the main family pools aren't as choked with children as they would be during the summer.
Which building I ask for just depends upon my mood that year. The last coupld of years we've asked for and been assigned Sailfish. This year I've asked for Cobia, Kingfish or Pampano in that order. We haven't stayed in Cobia for 4 years and haven't been in Pampano in 3 years. We've never been assigned to Kingfish.
Originally, they were selling Kingfish as an "exclusive" location and you had to buy into that building to stay in that building. That didn't work out so well for Marriott. A couple of years ago one of the letters we received from OP's management stated that all requests couldn't always be honored and expect to take our turn having to stay in Kingfish.