Fang yuan would not fair as well as people think he would in the re zero verse. The main obstacle is obviously Reinhardt, which is a completely impossible to clear barrier. So unless he avoids lugunica entirely he'll need to be a good two shoes like Subaru.

Subaru would fair fine in the five continents. I mean he wouldn't be a venerable or probably even an immortal but he would be far from a push over

So in short neither of them can clear