When ordering my unit, the dealership highly recommended I add the Fan-tastic fan for air movement. It is multi-speed & thermostatically controlled which is great.
Never had I experienced any flutter from the lid dome on the Fan-tastic fan located near the front of the camper nor from the factory fan located toward the rear of the camper.
I've very pleased with the Fan-tastic fan but must admit, no experience with the Maxxair fan.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.