This is my PC 625 with the 4" barrel. It came with the red, white and blue grips, but have replaced them with the American Pride bought from S&W.
Like you I was debating between a JM or a PC model and when it came time to order, the JMs were not in stock, but there were a couple of the PC ones in stock, so for the extra $100 I bought the PC.
The trigger is unbelievably smooth, right out of the box and it is a tack driver. I think the black accents look nice too.
I have seen a JM, but have never shot one, so I can't compare the trigger.
I don't think you could go wrong with either gun. Good luck deciding!