The factor that pushes Xikar over Palio for me is the bling (cause I think they sre so cool) and the biggest factor...
Palios make me bleed.
My hands don't work so good, and when I use a Palio it pinches the skin between my thumb and forefinger whe the cut "snaps".
I don't like tools that hurt me, so I stick with the Xikar.
If you can feel your hands, then by all means, a Palio is a nice cutter.
I like metal over plastic, too, and the plastic Palio just didn't seem of any higher quality than all my $5.00 cutters.
I don't know that Palio makes an all metal version, because I haven't followed up.
If they do, by all means, I'd love to try one.

To Qualify, every single cigar cuter I use right now are all metal construction. It's just what I like.