i would say J12..i have a cartier and although they look amazing..i stopped wearing mine everyday as the strap gets very easily scratched, its more of a special occasion watch than an everyday watch, if your planning on getting a gold cartier theres no point getting something similar..and since u already have a rolex i think u should go for something different...i recently bought my white j12 33mm with diamond markers and absolutely love it! the watch is so pretty and substantial and the ceramic body gives it something different. it was a diff descision for me black/white..bling/no bling etc..the ceramic is extremely scratch proof! both the black and white are stunning..if your going for a casual watch i think it would be perfect. i dont think its going to go out of fashion anytime soon as its based on a classic design and the 33 mm does'nt look too sporty. both the black and white are very wearable colours...i see myself wearing mine for a very long time...good luck choosing!