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are road spds that much better?
There are pros and cons. Using MTB pedals on your road bike means you can actually walk into the café without going arse over tit, and you only need 5 pairs of shoes rather than the ten you need if you have two different kinds of clip-in pedals. On the other hand, some people like the way road pedals stop your foot from rolling if you have really terrible pedalling technique and think that it actually matters.
Do you have, and like, SPD on your other bikes? Do you prefer to do what you like, not what other people think you should do?