I would have to go with the Toro. As you know I have the timecutter myself, and I use it commercially. It is built well, and I have seen them take a lot of abuse and keep going. If you get one though, fill your front tires with slime. I would recommend the toro. Makes my life easier.

I have the z4200. As far as I know they are the models from 2005 ot something to 2010. Toro re designed the timecutter, so i dont know about the ss timecutter. Mine is the 42 inch model 19 horse kohler. Got it used with like 70 hours on craigslist for 1750. No problems yet except the front tirrs always go flat.
=/
A_tank96
I did buy some slime to go in them. Thought about the slime tubes for tubeless tires bu i couldnt find them anywhere. I read a lot of good reviews on the slike, hoping it works for more than two years.