I have been riding a Wee Strom for 3 years and got a 1250S Bandit in January. They are way different. The Strom is more comfortable, but the Bandit is more exciting to ride. Every time I switch between the two I'm torn as to which one I like better.
If you're on the shorter side, the Bandit might be a better fit. The Strom is a much larger bike; you sit more in it than on it like the Bandit. Properly equipped (Madstad, Givi), the Strom has much better wind control. I put a Zero-Gravity sport touring (taller) screen on the Bandit, but it still has a lot more wind noise.
Strom gets 50-55 mpg, the Bandit gets about 40. But when you open them up, it's like a pickup truck vs a sports car. Bandit goes NOW whatever gear you are in. Strom requires some advance planning and shifting for passing.
Since you are coming from an 800cc bike, the Wee might be underwhelming. I've never ridden a Vee, but the size might be more than you are comfortable with. Bandit's heavier, but the weight seems to be carried lower. They both handle well, but feel different.
Hope that helps. I'm probably going to sell the Wee, and hope I don't regret it later since it's set up just the way I like it.
Here are some pics:
K7 Bandit 1250S