You have to take into account as you said in your first post whether you want to sell or not.
When I did my b-room a few years ago we had decided to stay in this house because my son had started school and we were going to stay in this neighborhood for quite a few years.
We changed what we wanted and didn't think about re-sell.
Personally if i had the room I would do separate tub shower but you have said you can't do that.
Find a nice deep jetted tub and add your shower as well.
Best of both worlds.
Just my .02
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