Cabin side control is better if YOU can do it... IMHO. One less firewall penetration. Who LOVES to drill Stainless Steel? Not me... I dislike heat muffs so much I was thinking of having plug in heated motorcycle suit, seat and gloves. Ha ha. I am kidding (kind of) but read aviation history in the OPEN cockpit days Air postal service in winter... those were manly men. Nav? IFR, I follow roads, and water towers. They flew at NIGHT as well, looking for light beacons that made up the "airway". Yeah. They crashed... a lot. Bottom line freezing temps and all the had was their wool, leather, scarf, googles. Some of those engines spit oil in their face...