I have both, a GN and a Ty. The Sy should be faster than the Ty because it's lighter with the same powertrain. The Ty is a fun truck to drive, 0-60 is blast coming out of the whole with all wheel drive but it kind of falls on its face after that. I have few mods on mine but nothing radical, maybe low 13's. I was told to leave it alone because it can't take the abuse like the Buick V6 can. The Sy/Ty maybe be slightly faster than a GN stock VS stock but the all the stuff you have out there for a GN, it's not even a match. The Sy/Ty is harder to work on also compared to a GN.
Even though I love my Ty, as far as the power is concerned, I had more respect for it before I owned one but it's still an awesome truck.
HTH
Prasad