I own both including some other compact Oly like Trip 35 and Pen Series.
Really love them 🙂
IMHO, XA is stellar in sexiness, uniqueness, swiftness (in action).
But it is scratch-prone and hard to repair if any problems.
35RC is great too, I love its solidity and capability of manual exposure.
But I found I have a lot less fun while using it compare to XA.
Maybe, because it's hard to change aperture ring, maybe it's less sexy/cute and surely I love black body better haha
I'd recommend XA over RC mainly by the joy of using.
And it's still very cute and charming with Black OM-4T and M6 sit by its side!!
BTW, you may soon get both anyway 😛