I want to get a px4 compact. Help me to understand some differences.

Compact carry 2 vs a Langdon model.

Is the trigger good enough on the Compact carry 2? I do want it to have a red dot eventually, is it better to just spend the money up front to get the full on Langdon model? Is the TJIAB worth it in the compact carry 2 model?

I can find the compact carry 2 for $819.
The Langdon model is $1,500.

If I get the compact carry 2 and the trigger is good enough, I can pay ~$350 for a red dot cut. Seems like the better deal. I think the TJIAB is $240.

Huge advantage is that the compact very can be picked up locally.