Are MK8 numbers more impressive than WD??

[Dusk]

Troll_Whisperer said:

WD's attach rate on PS4 is probably gonna be higher than MK8 on Wii U, so the "only on one platform" argument is not good enough to put MK8 above WD in my opinion. It's a new IP too. The fastest-selling one in history!

I'm gonna go with Watch Dogs.

What are you on about? Fastest selling what in history? 

Edit: Didn't realize that WD is now considered the fastest selling new IP in history. That I think is more impressive than this comparison.