Haven't got one yet, but have been reading quite a bit. They are completely different animals.
Champion
.40 cal
75B frame
Adjustable sights
Highest capacity mags 13 (15 with extensions)
4.5" barrel
Czechmate
9mm
Tactical Sport frame
Fixed sights and C-More red dot and mount
Hightest capacity mags 26 (comes with (1) 26 and (3) 20 round)
5.4" barrel
Both guns are designed for USPSA/IPSC Open class. However, the Czechmate is about 10 times more competitive than the Champion in that division. Since the Czechmate is a 9mm AND is built on the larger frame, the magazine capacity is almost double that of the Champion. That allows you to shoot a stage and only have one reload, as opposed to two or three with the Champion. Plus, it can handle 9mm major loads, which means that you are at no disadvantage in scoring for shooting the 9mm vs .40.
The only downside...the Czechmate is 2x the price of the Champion. But for that price...you are getting a complete racing package. You have the gun and enough mags to run right out the door. It is less expensive than a S_I, and just as competitive, IMHO. It is more expensive than a EAA Gold Team, but not really that much more expensive than a Gold Team with the same magazine, sight, and barrel package.
It is on my wish list after we get our medical bills paid off.