Hi there,
Yes, I would definitely sell J12 for Rolex. Rolex is a good make watch and classic. Prices increases yearly and has good resell value.
J12 is trendy and very fun, but it's not as a good watch compare to Rolex. I have 2rolexes and Franck Muller. I recently bought David Yurman diamond bezel 18kt yellow gold but ended up returning it because I rather have another Rolex instead.