The R has the same elements of "modern" design (sunburst dial and white writing and subdial markings), but with a warmer and more classical look.
The J is the only one with a grainy dial and black writing and subdial markings: it is clearly the most vintage inspired of the 4.
Out of the three I've seen (J, R and P), it's very hard for me to tell which I prefer. But probably J.