A few reviews and comments I've seen about the dual have been that the single is better.
I do have the single and it's quite good and will skip the dual.
I tend to say, since you're using a regulated mod, the ohms (as long as not too low) aren't as important and I tend to fill my RTAs with the most wraps and decent diameter coils that I can so to get a good amount of metal mass in there, and the better experience.
As singles are easier to build and the difference is actually quite minimal if you do a good single, I've been recommending singles more and more, heck, most of my duals that I can go with single coils, I now go that way and find that it improves due to the better airflow I get out of them.