Have a joyetech mega here, and it's nice that you can use temp or sub ohm, or even a 1 ohm MTL.
But the kanger has the edge due to the sheer variety of coils and third parties making coils as well, for those not into rebuilding.
Plus, it has two proper MTL options, that don't gurgle/flood or do dry hits unlike the ego one, with the occ and ssocc 1.2 and 1.5 options. So the kanger gives you pretty much everything from temp control to the much improved ssocc sub ohm to a genuine bonafide MTL.
personally i chose the pro tank 4 over here as it takes the same coils and i love the looks of it.
My only gripe is that i'd like to see some stainles steel temp coils for it, even if not from kanger themselves. But then again, the ego one only has nickel or titanium anyway (i can confirm, the temperature control coils of the ego one work very very well).
The CLR coils are better even for those who just want pre made coils, much better than CL.