Depends what you are looking for...Take a look at my website below for pictures of each area.
Cabana 9b is close to bus stop 1 and the main building with a short walk to the Dig Site (main pool) over the wooden bridge. Most convenient location and most preferred.
Cabana 8a is close to the Dig Site (and playground) and bus stop 4 with a short walk to the main building.
Cabana 8b and 9a are inbetween the 2 above. 9a has a quiet pool and is also a smoking optional building.
Ranchos 7b has a quiet pool, is close to the Dig Site and bus stop 4 with a bit longer walk to the main building. 7b is behind cabana 8a.
Casita 3 has great courtyard and fountain views but you will have to walk or ride the internal shuttle to get to the pool.
ps - Most of the suites are in the casita's, but there are a couple exceptions:
All 5 Executive Suites are in Casita's 1. All but one of the VIP Suite's are also located in Casita's 1, the other is in cabana 9B. The Junior Suites are in Casita's 1 & 3, and there are 2 or 3 in the cabana's (One each in 8B, & 9B, and I think there is one in 9A.