Pad change and ease of bleeding (in a motorsport context) is the main reason to go to a fixed caliper.
Clip at the top comes out, slide out the two pins that hold in the pad, slip the two pads out, slip new pads in, replace pins and clips. Takes a minute or two.
Bleed screw located at the front instead of the back of the caliper allows for fast, on-ground bleeding in case you boil your fluid.