ive been researching the same. For me it was between the eVic, innokin itaste SVD, and the Sigelei Zmax v3.
My brother got the eVic, so i didnt want to be a copycat, as well as i heard that its fragile, and i have a tendency to forget when i have something laying on my lap untill i stand up..... so i wanted something built like a tank. I really liked the zmax, but i dont like the idea of having such a complex menu with only a single button. Plus there is no shortcuts to getting the resistance of your atty, or checking your battery etc. the SVD is perfect IMO. Its got shortcuts, an LED fire button that shows you how much battery is left, + and - buttons, and its VV and VW. A winner for me!