A properly built tiled shower with some nice porcelain is an asset to the house, while an enclosure generally isn't, if that's any help! Lots of things you can do in a custom shower (for one, make it the exact size you want), and include things you just can't get in an enclosure, like niches in the right place and size for your needs and maybe a bench or footrest so your wife can shave her legs easier. If you consider a surface membrane under the tile, and it's properly built, mold and mildew aren't a problem, either.