I've got 3 pairs that I rotate around w/ depending on what muscle group it is. I prefer extra pad for chest day, something that my straps will fit around on back day and leg day I just need something so I dont' slip when I'm leveraging myself in & out of some of those wild leg machines. I also like something that can survive the washer since they get extra funky after a few weeks. (I'm one of those chicks who *sweats*, not "glows", in the gym...)
I used to be part of the "good ol' boys club" where we would compare callouses at the end of every month. Most of the guys would wear gloves, but it was sort of a "bigger dick" thing to have the most ripped out gloves. I'm proud to say that based on the condition of my gloves & my hands I was sporting a VERY nice "package".
BUT, now that I'm a member of professional society, the callous look doesn't make a big impression when I'm shaking hands w/ the CEO, so I opt for rotating gloves. I'll let my 15" biceps do the "bigger dick" talking for me ;c)