of the limited number of ali's and tyson's i have seen, the tyson's were wider tracking and had thicker butts top to bottom than the ali's. seen about 5 tyson's, 7-8 ali steers. the tysons were a little smaller. one tyson steer got reserve grand in our little fair, again, not too many animals in our fair, but hey.
I seen Tyson last year at Core's and really liked him. Didn't use him because I hadn't seen any calves out of him at that time. Deb Core used him quiet extensivly from what I've heard. I wouldn't hesitate in calling her and asking what she thinks he would work on best. She really knows her stuff and will be honest with you about it. That is from my own personal experience with Cores.