Do men generally prefer female voices and vice versa or is it the opposite?

I usually find men's voices easier to listen to, perhaps more pleasant on long terms, but I couldn't say they are more expressive. Both the tenor in Berlioz's Requiem and the soprano in the closing of 'Lucia di Lammermoor' are expressive. So is Fischer-Dieskau singing lieder and Renée Fleming in Händel's airs. It's hard to decide. I guess it's much more in the music itself than in the singer.

As for ranges, my favourite are tenor for men and alto (or mezzosoprano) for women.