Your bathroom storage bench plays the exact same role as a bathroom vanity. It can be used to store stuff and it also enhances the beauty of the bathroom. That is why in choosing the design of this kind of storage in the bathroom, you have to make sure that you know what will be bench be used. If the bench will be used mostly to sit and the storage function is number two, make sure that the design is supporting the comfort when people sitting on it. It can have quite large seating area maybe with cushion to make it more comfortable. Beside of that you can also add small pillows in the bench so that when you sit on the bench, you can feel more comfort.
That is the way how to make the bench comfortable for seating. However, if the bathroom furniture is used mostly to keep things like towel and stuff, make sure that the storage area is wide enough. You can sacrifice the seating area by adding more storage under the seating area. You can even add more drawers and woven basket around the bench so that more stuff can be stored in the bathroom storage bench.