I agree with what Gloomshadow said, except for the forgiving part. It may be forgiving if you are in the wrong gear and jump on the throttle, but thats about it. In my opinion, the Buell rewards you for being on your A-game, and punishes you for mistakes. The SV just goes about business on an even keel.
I think its more about what you want out of the bike.
I had an SV650 and sold it for a XB12S. The Buell is 100x cooler and way more dynamic. Its like driving a full-blown race car on the street. The dictionary should have a picture of an XB12S next to the word "awesome".
After a couple of weeks of riding the two bikes back to back, the SV650 actually won out (for me). Here's why:
- The motor is way smoother. Even though it revs a lot more, its like buttah, for a V-twin
- Its is much quieter. Even with the db-killer removed from the aftermarket exhaust on my SV, which made it super loud, the XB makes it sound like a lawnmower.
- Shifting. I never thought the SV shifted very smooth, until I rode the XB for a bit, then went for a spin on the SV. Also, the XB clutch is much heavier than the SV. Love the Muller power clutch!
- Riding position. The XB has a very unique riding position, very upright, yet aggressive. The SV has a bit more of a forward lean, but its much more relaxed. Wider bars made it much better (Renthal Streetfighters)
-Handling. The SV suspension sucks. There are a lot of things you can do to step it up, but I think the XB is still winner unless you plan on extensive mods. My bike is my toy and I enjoy doing mods, so the upgrade-ability was a definite plus for me. The XB is ridiculously short and it feels like it should be completely unstable, but it is NOT! If the suspension is set up correct, the bike rides well and handles great. If you have never experienced a XB, do not buy one sight unseen (ala eBay). Make sure you sit on it first. It is VERY different. A skilled rider could probably defy physics on a stock XB, a squid is probably on his deathbed.
- Reliability. In the short time I've owned the XB, its almost stranded me about 3 times. I was able to fix it on the side of the road and get back home, but in the moment that "oh sh1t!" feeling is ummm, "priceless". The SV just goes.
One is like dating a porn star, the other is the girl next door.
PS. 16K miles, never dropped, mint condition $4500.