You should hop over to the Dis camping forum!! You'll get a lot of good advice there. Many of us are addicted to camping at FW. Things to consider:
Would you prefer being close to the pool/campfire program? Or closer to Pioneer Hall and the marina? Do you want to be farther out where it may be quieter? Are you bringing a pet? Do you want to be near the comfort station? Are you traveling with kids?
Come on over to the camping forum.....let us know your requirements and you'll get lots of ideas on which loop to request. Remember the most important thing to request is a site that fits your RV. (awning, slides, total length etc )