I sort of understand, they're both for different things. Apples to oranges.
I'm certainly not going to try to talk you into loving the K100, but it really all depends on what your topper is.
The nice thing about the MVP2 (and other regulated
mods) is that you can tailor the voltage or wattage output to fit your topper.
With the K100, you need to fine-tune the wick and coil to "fit" the unregulated voltage output of the mech, and it's only going to be "good" within a certain range of voltage.
What atomizer(s) are you using?