I was on this years turbo dream at a demo at snowmass last year. I liked the ride it was very stable and fast but not nearly as quick edge to edge as the SL. Part of that may have had something to do with the bidings I was riding (k2 auto) which were ok but just not my cup of tea.
The SL also rode much shorter than the Turbo Dream, which I prefer. felt like I had about 4 feet of nose, which was awesome for the powder, But I definitely missed the edge to edge ease of the SL.
both boards are sweet no matter what you decide