I would definitely recommend the Sierra Tower. You will either have a view of the pool or of DtD/CA. It is very convenient to DtD - especially if you use the back entrance. It is also convenient to the main pool.
Marina Tower is a good pick as well, but if I were placing a request, I would pick Sierra. Be sure to have the request placed on your reservation - it is easier to have them be aware of the request prior to check in than try to get that tower once you arrive.
I also wanted to note that they have pack-n-play in the closets, but you can request a crib in your room from housekeeping if your 11-month old would rather sleep in one.