If you've never had to do the regular maintenance on a whirlpool, you may not want to deal with one - used regularly, it requires some pretty strong chemicals and time on a monthly basis or things start growing inside and are a bear to clean out. As a result of researching that, I opted for an air tub - it's not as vigorous, but it's much easier to keep clean as it blow dries itself from the inside and isn't pumping bathwater through the internal piping. Plus, you can use any bath oils and other stuff that are not approved for use in a whirlpool. Most of these type of tubs come in many versions - if you're going to use it as a shower, you really want one with a factory tiling flange although they usually sell an add-on one (can work, but integrated is better). It would be very unusual if you didn't have to move the drain at least a little. Also, since this type of tub is designed for soaking, the actual flat bottom is often fairly short - I ended up buying a 6' air tub, and it would have been wonderful to have put in a 7' one.