Only CCV has some studios that have only the stand up showers and they are a booking category. All other DVC resorts have the tub. At some it's a shower/tub combo and at others its a tub with a separate stand up shower.
Riv tower studios only have a shower. Also only 1 sink, it's in the bathroom. So you need get water for your coffee in the bathroom, do your dishes in the bathroom....