Clipless vs. Flat Pedals
What kind of riding will you be doing?
Mountain biking: Flat pedals paired with grippy bike shoes allow easy dismounts; clipless options offer more pedal efficiency, control and power while climbing, and feature 2-hole cleats.
Road cycling: Clipless pedals offer the greatest power and efficiency; often feature cleats with a 3-hole design.
Read full article: How to Choose Bike Pedals