I have both and enjoy using both. No quality issues on either.
This being said, if I could only have one, I would take the MVP because of its excellent battery life. The iTaste is 800 mAH (I think) while the MVP is 2600 mAH. Given my heavy vaping, the MVP lasts me three times as long as the iTaste. For me, that's 2 full days without needing to recharge. The MVP travels well, is solid, and with an Evod or CE, will fit in an Ego carrying case (ok, it's a tight fit, and you need the big size case, but still...)
Both are high quality products and well-designed. Both are VV and VW (if you get the MVP v.2). The MVP will also serve you as a charging source for other stuff. Pricewise, at FT, the MVP v.2 is $45 and the iTaste kit is $39.
Hope this helps!