I would also strongly advise you stick with classic color combinations that permit a future buyer to accessorize to suit their personal tastes. When it comes to tile think White, Black or Slate Grey. Subway tile in any size is always popular and gives a classic yet contemporary look. If there's not one already make sure to include a double vanity.
If the bathroom is nice - and there is tub in a 2nd bedroom - a double shower is fine.
For a 1br I'd do both - a tub and a shower.
This also depends on what statement you are trying to make.
If you want to project luxury - then a tub and a shower will do better (giving the owners options of bathing or showering). If this is a rental - as long as the shower is nice (and double shower is) - you'll be fine.
Hope this helps,
Beachfront Realty, Inc.
You need a local professional who can tell you what used to sell, what is selling, and what seems to be on the horizon in the future if possible.
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That said it is your home and you should do as you see fit, enjoy it and not worry about the resale value as you should recoup most if not all your costs either way.
You can't please everyone. It really depends on the size of the bathroom and what you can do with it. Some Buyers must have their deep jetted tub. Others don't use the tub and want a nice walk in shower. Some want the option for both.
So enjoy your home.
It is nice to have the detachable shower head in the shower tub combo for cleaning. Also some people like to clog the tub while they shower and sit down to shave their legs or whatever it is they do.
Hope that helps. The more tubs the better unless you are in an elderly complex.
"Your Angel in Real Estate"
Stanberry & Associates
Good luck on your project.