I own the G, and I hope to add the 5231J. Just declaring my bias right away there. To be honest, I never noticed the longer lugs of the 5130, but that is a big plus for the 5230, in my opinion. All of this comes down to preference as both are very well made and beautiful watches, but my tastes go to the smaller case, the guilloche, and the lugs and lack of crown guard that harken back to the 2523 of the 5230. I think it’s a reference that is being overlooked at the moment perhaps due to how they priced it compared to its predecessors - not that this should become a conversation about that, but I do think it makes a difference.