I'm 6'3" and 250 lbs, and when I sat on the Sportster 883, I felt like a Shriner on a mini-bike. I tooled around a parking lot on a Sportster 1200, and it didn't feel much different, size wise, than the 883. It's just a smaller framed bike, no way around that, whether you do what a previous poster said and "remember you're on a Vulcan forum" or not. For a guy your size, it's just gonna feel cramped. At least, that's my guess... Even the Harley Dealer laughed at me when I walked up to sit on the Sportster. "That bike's gonna feel like a wedgie, man" is what he said, if I remember correctly. And the 1200 owner that let my test ride his machine took mine for a ride as well, and said something similar to "She's only a 900? She sits a lot bigger than mine." For the record, yes, he still loves his Sportster 1200 and I still love my Vulcan 900.
As for performance/handling comparisons, there are quite a few reviews out there that compare the 2 side by side and offer great insights into the pros and cons of each bike (a couple were even linked above), but a HUGE difference (in my not-so-humble opinion) is the size of the gas tank. 3.3 gallons on the sportster (based on my research in 2009, I think some versions come with 4.3), as compared to 5.3 gallons on the vulcan 900. Not only is the tank larger, but it's a bit wider a well, changing the feel of the bike a bit, and offers nearly a hundred mile difference between fill ups.
The Vulcan is also a bit more comfortable for someone riding 2-up than the sportster (based on my wife's opinion, who sat on the back of both when I was looking for a bike). Of course, I went with the 900 Custom as the skinny front wheel and forward controls appealed to my wants in a bike as well, so I can't compare foot position to a Vulcan 900 classic/LT.
Don't take our word for it, though. Go sit on a couple, test ride if ya can, and choose the one ya like the best! 2 wheels... (or 3 for some)
