Intake and exhaust of air flow question!!!!

I got a 6' x 6' bathroom in my trailer that I plan on making a small grow room out of. I plan on having a two high powered fans... my question is should I have my intake sucking air from the adjacent room and have the exhuast going out the top of the ceiling outside. Since I am in a trailer the ceiling has fans used to suck out the hot air. I am not sure if it would be better to suck air from outside to inside or suck from the other room inside the trailer to outside..

It will be best to circulate the cooler air in.
If ya got good ac, bring it from the inside

I would bring air in from the other room and exhaust directly outside. With air moving from the trailer to the grow room, you won't have odor problems in the rest of the trailer.

https://www.rollitup.org/indoor-growing/407048-20-000-watt-medical-grow.html