If you have a one bedroom at KV, it will have two real bathrooms with the master bath pretty luxurious. All the Jambo House villas are converted hotel rooms. Studios at both are about a wash, similar in size and how they look. If you get a standard view at JH, you'll be looking at the pool or a not great savanna view. If you book standard at KV, you'll get pool or parking lot or not great savanna. All villas at JH are on the fifth floor with five two bedroom lockoffs on the sixth floor (concierge villas).
Now when we stay at AKL/AKV on our points we'll book a savanna view one bedroom at KV (better one bedrooms at KV than JH). When our son was working for Disney, he'd get us cast member discounted hotel rooms at JH.
The little store in KV has a good selection of groceries for your villa, frozen foods, refrigerated foods, canned goods, boxed stuff, etc. JH has a similar selection in their store. You can also purchase pastries in the store at KV, as well as fountain drinks, coffee, etc.