Just want to know which one is better and why?
160 F or the 190 F thermostat.
Will the thermostat make any different on engine performance?

thanks?

Engines are built to run at a specific tempature. Cooler is not always better. Your Jeep is set up to run right around 210. This is where the engine makes the most power. Too high or low on the temp and you will lose your performance.