Also, I find that travel wear the frets a great deal! Clamped in the the case, riding in the back seat, vibrating all the way. If you slip a thin sheet of cardboard between the strings and the frets, it will eliminate the travel portion of the wear. But, as Paul mentioned, even bad looking frets can play just fine.
Jimmy is right in the frets vs. strings battle - someone has to win

Steel is harder than nickel, and so the frets lose in that battle, but they might win for tone. It's all a tradeoff.
We've been using a Jescar wire for a long time. Before that it was Dunlop, and of course any custom job will have whatever fret wire was ordered by the original owner.