For newcomers to the topic Klickpedal: SPD has the advantage that with the MTB shoes also can run well, you wähend performs a limbo with most other cleats.
While it is frowned upon by racing cyclists to ride MTB pedals, but that is unnecessary snobbery: I drive those pedals of course on bike.
Smart spenders can buy pedals from the simpler groups, PD-M 520 or 540, they are not quite so easily For Example and pretty, but otherwise have no disadvantages, they also work perfectly and are durable.
Caution: normal Pedalschlüssel go on 780 not, it takes a 8mm Allen key and is not to be found in every workshop. When in doubt to buy.