The useful first question when choosing pedals is where and how you ride. A broad flat pedal works with ordinary shoes and lets you put a foot down quickly. That makes it convenient in town, where a journey may involve frequent stops, a shop visit or a walk after parking. Some mountain bikers also favour flats paired with shoes whose soles grip the platform well.
A clip-in system uses a cleat attached to the shoe that engages with the pedal. It keeps the foot in a consistent position, which some riders appreciate on longer outings or rough surfaces. The trade-off is learning to twist the heel outward to release before coming to a stop; practising that movement in a quiet place helps. Pedal, cleat and shoe also have to be compatible with one another.
Think about walking after the ride as well. Two-bolt cleats are often recessed into the shoe sole, making walking easier than with the larger three-bolt cleats common on road cycling shoes. A combination pedal is another option: one face is flat and the other accepts a cleat. That can suit a bicycle used for both commuting and longer training rides. The best choice follows your routes and footwear, rather than whichever pedal looks most race-oriented.