Today the Best Run is based on the dungeon with the shortest run. It makes this information nearly relevant because of the poor balancing difficulty between dungeons. A more relevant information would be to display the Best Run based on the world or region ranking: in the screenshot example my Best Run would not be UNDR 23 but NL 23.

On another instance, because hypothetically a NELT 21 would beat a UNDR 22, I suggest the follow displaying:
Best Run +21 NL (+22 UNDR) instead of Best Run +22 UNDR