Hey buddy i've seen ya at a few matches before. I've had 2 Shadows that were done to full retard. I sold the Shadows and went with the Stock 3. Here's my pros/cons of each:
Trigger-Shadow I've done everything to the Tangfo and the Shadow will always have a better trigger.
Design-Tangfo, square trigger guard, adjustable rear sights, larger rear sights, better grip with bigger beavertail, magwell, you can fit more of your hand into the grip due to smaller hammer spring, front back checkering is more aggressive, longer sight radius, heavier gun, longer barrel, quality of gun, fit of frame and upper is tighter, if you wrap your weak hand index finger around the trigger guard the Tangfo is made better for that too
Magazines, holsters, grips, parts-Tangfo mags are better than CZ, holsters for Stock 3 harder to come by, grips are more expensive, not much aftermarket and a wait if you can find it (Hammer)
I'd say if cost isn't an issue the Tangfo overall is better but the Shadows trigger can not be beat.
As far as the trigger goes Tangfos to get right don't really comply by IPSC rules other than the 5lbs D/A-I havn't seen one yet that would go below.