I had the curved trigger in my P365 and the straight trigger in my P365XL. I prefer the curved trigger, which also has more room inside the trigger guard to fit a gloved finger. I replaced the straight trigger in my P365XL with a curved trigger and sold the straight trigger.
The action of the straight and curved triggers are identical. The only real difference is in the way the trigger feels on your finger. If you have thinner fingers you can pull the trigger closer to the tip and have more leverage, but you will also need to pull the trigger further than if you are pulling in the middle. My finger is large enough that I pull near the middle of the trigger with either trigger.
if you want to perform a fair comparison, you need to use the same FCU with both triggers.