Is the delay in the standard DD3 better than the delay in the RV3 Reverb Delay?

Or to put it differently, is there a reason to prefer the Boss Delay Stomp Box over the Reverb/Delay stomp box?

I'm mainly after a delay effect, but having a decent reverb would be nice too.

Well a dedicated delay pedal would have more features than the delay part of the reverb delay, so it would be better.