On the basis of aftermarket prices only, i'd say keep the YF-30 and just keep a lookout for the VF-0D as the YF-30 is insanely overpriced currently, you may not be able to afford it down the line if you do decide to buy it again once sold. The VF-0D on the other hand hasn't increased in price as much.
I sold my YF-30 at cost and do regret it sometimes, but not enough to pay current aftermarket prices for a replacement.