Usually XLR will give you a lower noise floor, that's the big benefit. I've seen some cables (transparent for instance) that charge roughly double for XLR vs RCA becuase they are running extra wire for the 3rd leg of the balanced run. I use all Transparent XLR and love it, but cables are system dependent.
I've heard on shorter cable runs, XLR makes less of a difference, longer, much more pronouced...
I've heard on shorter cable runs, XLR makes less of a difference, longer, much more pronouced...