My tour bike is 290 lbs. Front hub is a SA XL-FDD dyno DRUM brake. Set and forget for 30,000 miles in any weather.
Nothing is better or safer. Overheating is a laughable concept. The first tour I had a useless caliper on the back doing 3% at best. LOL.
My Rohloff14 has a cable TRP Spyre with SA levers set to long pull. Stops dead instantly, can't beat that. Resin pads only lasted 5,300 miles, but never squeaked. The gap is of little concern. My dropout is horizontal.
BB7 are dinosaur tech with one piston and 15 mm clunkier. LOL.