Hi Thurgood,
I don'tn think you will like my answer. When discussing the rose gold Royal Oaks, I was under the mistaken impression that you meant a rose gold Royal Oak on the matching gold bracelet. To be honest, I really dislike Royal Oaks on a strap. There are others that may love the look, but I find its an incomplete design. When I see photos of the original sketches, it shows a watch with an integrated bracelet. I personally would never buy a RO (whether gold or not) on a strap. I feel the same way about Patek's Nautilus on a strap, I would never consider one on a strap. I realize that there is a huge price discrepancy between the RO in gold on bracelet or a strap, and a RO with a gold bracelet is beyond my budget so I sympathize with you regarding what the difference in price may be.
Personally, I'd rather have something that is more of a dress watch than a RO, if I were getting something on a strap. I would much rather have the ROC or a 15400 in SS on a matching bracelet.
If you got the chrono in SS, its a very different watch from the 15300 so you could easily own both. If you got the 15400 in SS, I'd say sell or trade the 15300 toward something else because they are too similar.
Obviously, you have to go with what your heart tells you and the watch that really makes you smile. I have shared my honest opinion on the various watches you have mentioned, but in the end I'm not the one that will wear these watches. Therefore, the only opinion that matters is your own.
Good luck and best regards,
Dino