I like an elegant flat backed neck with a slightly wider fret board (54 mm compared to some that are only 52 mm). Someone once told me the thicker, rounded neck backs are called Madrid style necks -- but I don't know if this is an accurate statement or not. After playing 54 mm widths for many years, I think a 52 mm width would not work for me. The same is true for rounded neck backs -- it is too late to teach an old dog new tricks.
"Things should be made as simple as possible, but not any simpler" A. Einstein