Ive been driving the V6 in my pacifica for 3.5 years. No major complaints. The GCL is a similar weight vehicle, and I believe that Jeep has tuned the engine further. (I hope!)
I will not be towing regularly, but want the extra tow weight capability if I need it.
I also had a 2014 and 2016 RAM 1500 with the V8. this was a nice engine option at the time. But for me I think its overkill on the GCL.
If I were towing regularly or wanted extra speed on the pedal, Id opt for the V8.
For my needs, I want the better gas mileage with extra towing capabilities (vs. what I currently have) if I need it.
And I do plan to use the 4wd /offroad options to a minor degree. I am looking forward to having that back (I had air-ride on My 2016 ram, and really liked it). I also wasnt able to do certain backroad trips for the last 3.5 years given the pacfiica..
(and I got the pacifica as the best FCA option for 6+ since I didnt like the durango)