One thing you haven’t considered is when each choice would be available. I’d guess R&M #556 would be built by Feb 2021. For GNR I guess that CE’s are built Jan-Mar and you’d get an LE by May 2021. So you could sit around for three months, complete the purchase of R&M and enjoy it for 3 months before deciding whether to sell it and buy the GNR. Both games are good so it comes down to what theme you like more. I’ve noticed that people develop a strong impression of R&M after playing it. It either grabs you or it does nothing for you so after owning it 3 months you’d know what to do. Good luck deciding.