I just rode my SL for the first time yesterday. I'm 5'9 and 155 lbs. My first board (the one I was using prior to the SL) is a 10 year old Burton Custom. The traditional camber feels more stable when bombing runs, and it feels like it "grabs" better and holds an edge slightly better when carving hard.
Besides those two things, my SL is more fun for EVERYTHING else. And even then, carving is just different on the SL, so i figure I'll get used to it and improve more. I was considering buying a heritage but most of my riding is done is socal where there aren't any big mountains. If mammoth was my home mountain, I'd have gotten the heritage.