Cant decide between Trek Domane AL 2 gen4 or FX 2 gen4

Completely new to cycling and just been researching bikes to maintain my fitness and tired of spending so much on gas. I plan on using the bike recreationally with my son and commute to work which would be 13 miles. I am a runner and do calisthenics but not sure how well my fitness level will be when doing the commute. I used Chat GPT to help me decide but it just made it more challenging to choose one so i figured its better to hear it from real people. I do need a cargo rack which the FX 2 is good for but i think the Domane can have one as well. I also like speed and comfortability(I don’t want my ass to be sore). My terrain is mostly flat. What do you guys recommend and how was your experience with either bike? Feel free to ask for additional info to help me decide