Depends on how much you actually use it ... in my humble opinion anyway.

Wire is great for constant use over rocky style ground, and rope for muddy style terrain. All that said though, the reality is most of our winches sit idle for vast periods and I would suggest very few (if any) of us drag the wire out every now and then, even when not being used just to re-oil, clean rust formation on the underlying strands on the drum, etc, etc ...

The missus has wire and I have dyneema rope - considering most the time it's just another weight on the car, I'll go rope 9 times out of 10 ... The wire on hers is very average looking after a long period of no use.