Both resorts they're quite different but equally impressive. Jambo is larger/Grander and has more food options, and Kidani is smaller more quaint/cozy...Animals are a plenty at both. And While the pool & area around it at Jambo is larger, their slide is kind of small. While At Kidani's the pool is more intimate, but has a fantastic slide, and also a water play area....Obviously this is a solo trip so I'm not sure if that will matter much, but one thing for sure are the hidden/secluded Hot tubs, which you might want to relax in...At both mind you...
Also, besides the great advice that has already been given, about the walks, and shuttle, there is a 3rd way you can venture over...Grab a DS bus, for it will stop @ Kidani right after pick up. When returning to Jambo, you can hop on any other Park bus, ( which will stop then at Jambo!!)
HTH...DizDad FWIW, The walk is kinda quick though...