However unlike wire, which starts to break down in visible ways long before it loses critical strength, rod can appear healthy until it decides to suddenly part. For distant cruising and easier repair, wire would win out.
We've had both, did in fact have a couple of occasions where the rod failed suddenly, a quick tack saved the rig. One failure was traced to improper maintenance the other to bad fabrication (the rod had been welded into the turnbuckle end).
So you have had a "couple of occasions" where your rod rigging failed? If so, that's the first actual case I have heard of rod rigging failure.
I have heard this "failure without warning" speculation over the years and have suspected it was purely theoretical, but if you have had it happen twice it seems to be a real threat.
Twenty years from now you will be more disappointed by the things y%^&*.....oh never mind. 90% of the people on sailing forums already use that as their signature! I'm not a conformist.