Roof tiles still better idea. Metal/plastic will have that annoying rattling noise.

As long as the installer use whole suite of Monier stuff
(Wakastrip mounting bar + Easy Flash Plus flexible seam joint between wall and first tile row),
radenshield heat insulation,
tile mounting if doing the hip and ridge (if new installation part includes diagonal raised border lines in layman term) use MONIER TOPFLEX;
and most importantly don't be pigeon or bird nest - MONIER Pest Guard

should be good to go.

Actually (IMO) not good to extend fully, makes it much easier for intruder to climb into the house (especially into first floor from your neighbour's example). Boost up on aircon grille. Reach roof tiles and 1st floor already, no ladder needed. Climb in to 1st floor.

For the ground floor.. the grilles need to be uprated very much as a intruder need a sparkplug to break glass or a flat screwdriver to snap it, and a cheap car jack to jack out the mounting/grille itself. Not noticeable on thunderstorm nights.