I currently have a 2007 XB12STT and I love the bike. It is my daily rider.
But...I have been really wanting a XB9SX.

So my questions are:

What are the different parts that separate the XB12STT for an XB9SX (besides the engine) and how are they different? (Short, stiffer, higher etc.)

For those who have ridden bikes similar to an XB9SX and an XB12STT- What is the handling different between the XB9SX and XB12STT? Is it worth having both of them?