There are guys running 42R's on V2. V2 was the shit back in the day a year ago. You have full control of timing, full control of fuel, full control of maf compensations. Its just the same thing as V2, with a side order of fries and a coke.
With Full V3 you get access to the the DA part of the ecu (load based stuff)
With lite, its just like V2, fuel sliders, timing sliders. You can adjust fuel as much as you want without it effecting your timing like an AFC, you can tune your timing however you want. Its only a 2D scale though, and the settings are only applied to WOT. Kinda like your AFC Hi settings. All the low throttle, fuel trim, cruise stuff is done in the MAF comp table which is also a 2d slider table. My gripe with this is all the high partial, the 5~9psi stuff will just feel like low throttle. You have no mid throttle power. The car feels like an on off switch. Like going to pass someone on the freeway you either go WOT or dont pass at all. Racing scenario, same car, same tuner, basic no extra fancy footwork like vtec. Tuned by either the sliders or direct acess 3d tables, if your car is hitting 11:1 AFR and 12* of timing, its going to make the same power. Both set ups will run the same time same trap speed. Only thing is V3 has mid throttle, you can do fancy footwork vtec, map switching, SD, GM MAF.
All wrapped up:
No tuning solution - You hungry
AFC -McDouble
So V2 - Big Mac
Lite - Big Mac combo small
V3 Full - Big Mac Combo supersized, cookies and mcflurry.
Evo8 ECu - Grill your own Burger meal
AEM EMS - Big Mac Combo supersized, cookies and mcflurry, Mcnuggets, McChicken, and everything else on the McDonalds menu( most of the shit you wont even eat)
Ostrich/Jakal/DSMAP - Big Mac
So ask yourself, how hungry are you.