medium facilities are better then small because of the larger coverage, in my opinion they are also better then large ones because they dont take so much space and dont need to be placed in the middle of the city all 3.
a nice little trick i';ve learned is that if you cover just 1 square of a 2x2 house, it is considered covered by that facility,
also facilities that have iregular coverage like 6x8 8x10 so on, can be rotated, if you provide them the right road.
so consider these when planning your layout.
