Traveling with a 2 year old - good for you! It's been awhile since we were at that stage but we've stayed all over Maui and as stated previously none of the other properties compare to FS Maui. The regular rooms are larger, Kids for all Seasons is a huge hit with all of my kids, access to childcare for a fee is the best, seperate pools and - THE CLUB FLOOR. Don't tell anyone about the club floor, it's a secret
You pay a premium, obviously, but with a small kid in tow it's simple simon to have most of your meals AND drinks in the club then occassionally do a nice couples dinner. The staff and service are unmatched! You don't need to seek service anywhere on the property because the club folks will take good care of you. Think of the club lounge as an extention of your room, like a family room (as long as your kid is well behaved).
* When your kid/s are older consider a room at FS and one at Grand Wailea. The best of both - luxury and a Hawaiian 'Disneyland' experience for the kids.
Here's to a wonderful getaway, whatever you choose !