As far as the feel your talking about (from the skate banana to the cobra) from my understanding the skate banana if a fairly soft board then the cobra is more on the stiff side, what will the major difference be?
So I've only ridden a 2009-2010 Skate Banana... and I'm guessing on the Cobra feel base on my expriences with the SL and read about the Cobra.
Skate Banana is roughly a 2 or 3 on stiffness and dampness. A Cobra is like a 5 out of 10 on both stiffness and dampness.
The Skate Banana is a true twin, where as the Cobra nose and tail are design to give you more float in powder and also more effective edge to allow more control at higher speeds.
The Skate Banana is flat-rocker-flat (Bananatech) which is very extreme variant of rocker and will make the board feel very boaty (like the board can pivot really easily without touching the edges). The Cobra is camber-rocker-camber so it will have less of the pivoty feeling and behave more like a cambered board once you get it up on edge (more control). In my opinion/experience, the mini-cambered sections will definitely give the Cobra more pop for jumps and turns.
The softer/rockered Skate Banana is easier to press and boardslide on a rail/box with (less likely to catch an edge on a rail too).
The Skate Banana has Magnatraction which you must have notices bites into the snow very early once you've engaged the edge. The Cobra will have a much more gradual bite feel (but I bet it will have greater overall edge hold as it is not as soft, more damp, and has a longer effective edge).