I have owned a C-100 for about a year and a half now. I recommend it. I have never shot a T-100, but have handled them at the local Academy Sports. The C-100 is very well made. It never fails to feed or eject any of the ammo I feed it. I have the S-120 as well. I feel like the C-100 and T-100 are about the same gun with a different slide. I would base my decision on which I liked better. From the discussions on this forum, I have gathered the T-100 does not accept aftermarket sights made for CZ compacts, as the C-100 does. You have a new Academy Sports opening in Florence, SC on the 18th. of April. They should have both models in stock when the store opens. If you call another Academy, they may tell you what models are showing in stock at the new location.
