I use both.
I see the benefits of both. Why let one exclude the other ?
Body wash is faster and easier to apply and I get a more airy less dense lather from it, which actually for me is beneficial. I don't shave with my soap lather, I wash my body.
Some bath soaps create an almost too dense lather and takes more water to get the right lather.
If I have the extra time in the shower, I use one of my 12-15 bath soaps, and usually end the shower with using a bit of one of my shower gels.
So I say both.
Cheers, Claus from Denmark