I have both the Vamo and the MVP. If you ate choosing between the two, I would get the Vame if you don't have another variable voltage device that checks resistnace.
I change atomizers throughout the day depending on what juice I want to vape and whether I am in the car, at the office, at home, or out and about. They tend to all be slightly different resistances and I like the variable wattage of the Vamo, just screw on the new atomizer and not have to change any settings. Plus the Vamo is versatile in that you can change battery configurations for a smaller size or a longer size with more battery life.
The MVP is nice and compact, and it has great battery life. But the inability to check resistance is a real shortcoming for me. After screwing on a new atomizer or tank, I will need to adjust the settings with the first few vapes to find my sweet spot again, something I don't need to do with the Vamo. I also do rebuild all of my atomizers, and here, again, the MVP's lack of resistance check is inconvenient.
They are both great PV's, it just depends on your vape style on what will suit you better.