Last year I refretted my Ibanez RG770 with SS.. After all was done there were a lot of improvements clarity wise... but I do not totally credit that to the SS, more so my old frets were just that dead.
To me, fret material doesn't matter that much as far as playing and sound go but, SS has less upkeep and maintenance, my nickel guitars I have to polish the frets more frequently, and the idea of significantly slower fret wear is a huge benefit. I have guitars with the fender 60s vintage radius and frets, up to SS jumbos, the back of the neck carve is a lot more important to me than the fret size or fingerboard radius,