Almost exclusively the bath for me. The only time a shower gets used is if I'm gettng ready to go out t'pub or similar.
Wallow in your own filth always makes me laugh. I have this image of the young ones in the bath scene..., hilarious. But in real life, I bathe every day, and in engineering, I can get moderately dirty, but really ?...wallowing in filth ?...hardly. No doubt, not as hygenic as a shower but infinately more relaxing. Bath every time for me.
Plus, I dont give a damn about how much water it uses, the relaxing properties on my aches and pains are worth every penny