It is a whirlpool tub -- a deep tub with jets. It is not anywhere near the size of the tub in the 1BRs at OKW though. And as you mentioned, the 1BRs/2BRs in Jambo House have a combined whirlpool tub and shower. There is no separate shower stall. (1BRs/2BRs in Kidani Village do have a separate shower stall as well as a second small but full bathroom. The rooms there are also a bit larger than those at Jambo House.)
We really enjoy our stays in OKW 1BRs and feel that none of the other WDW resorts really compare to OKW in terms of spaciousness but we love AKV for the animals and the atmosphere. You will give up some things but you will get a lot of other things you don't get at OKW.