If you do get a shower bath its worth paying extra for a proper, fully enclosed screen as otherwise you’ll be constantly wiping up water with anything like a decent shower.
I don’t think the shower baths are all they’re cropped up to be and they are cooler – an enclosed space keeps the heat in better.
When kids are grown up we’ll probably take the bath out and replace with a walk in shower.
With regards to resale, if you do it smartly it shouldn’t be too much hassle to replace the enclosure with a bath, maybe £500 tops? Are you thinking of selling it again in the next few years?
You can only make use of the extra space in the shower bath if your shower stack is offset from your plug hole, or your plug hole is not in the central line of the bath otherwise you just end up with it in the same place. Whatever happens, it will spin your OCD like a mad un.
Better off getting a slightly wider conventional bath as manufacturers seem to charge a premium for fully enclosed curved screens for very little extra useful space.