If you’ve already decided you like the hard grain look of Rodinal, then I’m puzzled why you’d ask about this film/developer combo. It seems you’ve already made a choice.
As for the backing paper mottling/transfer issue, I’ve observed it on every 120 film I’ve used in the past 2 years. If you buy fresh film and use it within months of purchase, odds are better that you won’t see the problem, but I recently processed rolls (all within their freshness date) of Tri-X, TMY, Pancro 400, Delta 400, and FP4 and all of them displayed the issue to some degree. Some rolls were closer to their expiration date than others. (URL links to results from an expired roll of Delta 100 I shot in 2019 and processed two weeks ago:
https://live.staticflickr.com/65535/50797307406_a028e62f82_b.jpg And no, I don’t typically wait two years to develop exposed rolls - this was found in a drawer in my darkroom)
My plan is to buy fresh 120 stock only when I expect to use it, and no longer keep a cache of it.