For me it's partly the difference between revolvers and pistols. The shape of a fine revolver, particularly an older Smith K-frame, is simply more graceful to me than the look of any pistol but a 1911 or '08 Luger. The most beautiful handgun I've ever owned was a 1970 Model 15-8 I bought in immaculate, unfired condition about ten years ago. That deep, polished blue, and those lines...
I've owned more pistols than revolvers, and two of my favorites were Glocks, a 22 and a 19. Not especially pretty but wonderfully engineered, which has its own appeal. I think some of the SIG's are visually very handfsome.
But I still love my steel wheel guns. Can't say the looks of the polymer-framed ones do much for me.
"Don't let macho be your epitaph."