If studio, preference is Jambo. The studios are about the same size at both. Jambo wins in that situation because it has the larger and more impressive lobby, larger store, and three restaurants to Kidani's one, and more shade at the pool area..
If 1BR or 2BR, it is a no-brainer, Kidani wins hands-down because the rooms are significantly better than the ones at Jambo. They are about 100 sg ft larger than Jambo, have the extra bathroom, more closet space, and have the separate tub and shower in the master bathroom rather than that atrocity of a combined jet-tub and shower in Jambo where the stepover to get into the tub is so high and wide that it can be very difficult to do for older guests or anyone with even minor knee or leg issues. Moreover, with a 2BR you can get a dedicated with the extra bed rather than couch in the second bedroom and a balcony that runs across all the rooms rather than having a wall between the studio and 1BR with a lock-off. The pool area is fine, with the extra long slide and separate water-play area for kids.