I am sorry that is a complete apples and oranges comparison. I own both kites so I know. The Lithium 12 has a huge bottom end and is a very grunty kite. It is comparable to many other kite brands 13-14. The Vector is the total opposite. A 12 vector is more like a 11 to most brands, and has very little low end. A 10 Lithium probably is comparable to a 12 Vector in the low end. So yeah you could do a Lithium, but I doubt you could do a Vector. The Vector is a fun kite when it is lit, it is pretty boring when it is not.
I agree, and especially so about the Vector. I demoed 12, 9 and owned a 7 m. They aren't what you'd call dynamic overall in the bigger sizes but much better 9 on down in terms of liveliness. Yes they're aren't powerful size for size verses some kites. I don't mean to dis [kiting t-rex's] kite. It's a nice progressive all around kite. I agree with SSK, just not comparable to some in terms of power.
Apples to oranges? Hmm, compared to the Vector you're right. My Lithium is grunty and certainly more bottom than a Vector, but comparable to a 14 m? Maybe some; it's forte is it's bottom end. On the flip side, I've owned the Cabrinha Switchblade and flown the newer North Rebels (size for size against my Lithium) and they both are not too far behind in terms of light wind ability. Maybe a meter difference, and in the Rebel's case you have to keep it moving but it goes once you build apparent wind. My older Switchblade, once going (albeit slow to turn) that thing would truck nicely upwind in marginal conditions on my light air board.
The Lith is more pull and go in lighter conditions and still my favorite size for size at the bottom to the middle of it's range.