I think, if you're still at a stage where you have to ask, it's VV/VW (I include myself in that group).
I still can't see the advantage of having to faff around with precision resistance readings because the mech mod has a fixed output.
Gimme flexible power that allows for flexible coiling anyday.
Life's too short to spend most of it buggering about with ohms!
However, there are people who LOVE all that faff - it is for them that the mech mod exists!
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I agree 100%, give me a VV/VW any day...