I don't know if you've messed with making
coils yourself yet, but if you have, or if you have an interest in getting started on it, I'd spend my money on some Kanthal wire and some cotton and get started on micro coils for the Protank 2 instead.
I see it like this: Kanger stock single coil heads aren't exactly consistently good - twice the wick and wire just seems like twice as many places they can fail in my opinion
Sorry, I know it's not a hands on comparison of the two Protanks, it's just my opinion.