Can you use mountain bike pedals on a road bike?
Condensed answer: Road and mountain bike pedals designed for adults have the same pedal thread (9/16” x 20 TPI). As a result, you can easily swap pedals between bikes. There’s nothing wrong with using mountain bike pedals on a road bike.
Are road pedals better than MTB pedals?
There is no real advantage, ergonomically speaking, between road and mountain bike pedal systems. Mountain bike racing shoes are slightly more flexible at the toe to allow for walking, but this is not an area in the shoe that affects power transmission.