Touch Screens on Mods are Gimmicky IMHO. I have the Reuleaux DNA200 and RX200, Vaporshark, IPV4S, YIHI ML
If you can budget the dough and you treasure Temp Control and full control over every conceivable option and setting, the DNA200's are unmatched and use an almost ITUNES proprietary windows program to adjust everything from Ramp-up times to customizing your own graphics for every screen to visually adjusting XY charts to customize your hits throughout 8 memory presets, and thats just naming a few!! If you want all that and want to stick with 18650's, Reuleaux DNA200 uses 3-18650's yet is it still one of the most comfortable mods out there, albeit heavy. And no battery sag from EVOLV DNA Chips!
If you want serious power with basic settings and temp control under $50, I think the RX200 is the best value out there right now. It honesty kicks the ass of just about all the other non-DNA/YihiSX350J mods out there. It also uses the Reuleax body and takes 3- 18650's
The reuleaux's are near identical except for the screen placement and menu OS. They're heavy but I can go a day and half pf heavy gaming while vaping heavy before switching out.
If you want moderate power and basic options and temp control, I still think the IPV4S is better than than IPV5
My wife alternates the IPV4S and a IPV D3 and she loves them both, especially the D3. Though D3 does not have step down as far as I know