In my opinion; it's gonna depend on what you want out of vaping.
At this point the mod market is slowly becoming several niche markets to cater to the various styles of vaping.
For me; being a tech geek and a budget based person. I got 1 mod for each style.
For all day i use my provari- in fact it gets use 99 percent or the time; I rarely use anything else - no matter what anyone says, it still has the cleanest output signal of any mod on the market and will still work even after an Abrams tank runs it over it's simply the most consistent and reliable device on the market, it ALWAYS works and ALWAYS gives the same performance.
For the few times I want to drip, I got a mech with a vtc5.
For the times that i want power I got a dna30.
Now my all day every day being the provari; ill give ya 3 guesses on my favorite. Thats why i just ordered a second one a mini, just because I wanted to.
That said it's totally up to you; but, i haven't met many people happy with the vamo after a few years.
I would suggest the mvp2 as it's cost effective and a huge battery and an all around great device until you figure out what you really want out of an apv. The MVP has a built in 2600 Mah battery and a solid high output frequency not as high as a DNA or provari but really close to the DNA frequency. The vamo has a 33hz chip; a lot of people claim to hear a rattlesnake sound out of it, I don't but every time I've used one I've tasted the juice burn. It compensates by using pulse width modulation to get the voltage you want. If you set it to 4V it'll pulse from 8v to 0v to give you an average of 4V- the easiest way for me to explain that.
Here's a pic of a sample of the MVP next to a provari so you can compare the sizes.
And below is a pic of it in my hand. Yes it is a throw away as once the battery goes bad you can only use it as pass through; but mine is a year old and still look and works great.
Here's a decent pic of its form factor