I would stick with preferred--all the way! We stayed at CSR in preferred back in October and loved the location. We were in a ground floor corner room in Casitas 3 looking toward the lagoon but in the back of a "u" shaped building area. Loved location for these reasons:
--Easy walk to El Centro for dining and gift shop. We often needed to pick up something at the gift shop like packages sent from the parks.
--Great proximity between El Centro bus stop and Casitas bus stop. Nice, scenic walk to the stop too! Casitas bus stop was wonderful. buses were usually empty when we got on in the morning and buses were very frequent. As luck would have it, one morning we waited about 10 minutes for a bus to AK(longest wait of the trip BTW). My DD10 started to complain about her tummy hurting and of course--hers meds were in the room. I literally saw the bus coming thru the far gate. I left Dh with the girls to get on the bus and I sprang into action. Fast walking and a few jogs back to the room, grabbed her meds, and made it to the bus stop at El Centro about 30 seconds before the AK bus with my family came rolling in. I hopped on the bus and we traveled together to AK--amazing!
--Although it is a hike to the main pool area, we only went there once a day. When you are at the pool, you have everything there you need. Towels, bathrooms, food, and drink. Love the pool here. Also--the Casitas quiet pool is very nice AND adjacent to the spa/fitness center for bathroom breaks. There are also pool towels here because of the spa
--The atmosphere in Casitas is just beautiful. We walked thru Ranchos and Cabanas and they were nice but could not compare to the beautiful architecture(sp?), fountains, and landscaping in Casitas.
--If it rains, you can wind thru the room walkways and get to the covered walkway to El Centro. We did this on a few rainy occasions.
You and your family will be gauranteed to be in one of 3 buildings in very close proximity. Without this, you could be VERY spreadout between Ranchos, Casitas and Cabanas. Have fun