I traded in my 07 SG for an 09 SG, so I'm obviously partial.
SG's are "the dark side of baggers" (someone else said, but yeah).
There's lots of differences, but it comes down to your personal preferrence/style mostly.
SG's don't have the chrome and embelishments to the fenders (even the EG Standard has some), no rear crash-bar, sit an inch lower, have a truly useless-for-long-distances seat, have a different (slightly louder, especially the 09s) exhaust sound, and according to some, slightly better performance. They don't have the passing lamps and bracket, one of the big differences visually. AND, if you're riding an SG, you'll never ever feel like your being chased down the road by an oddly-shaped piece of tailgating Samsonite luggage. (Unless you add the 4-point hardware and a tour pak).
To each his own, and it's clear where my loyalty lies.