MMA power vs. Boxing power.

Too general a question. If you are talking about the top pro boxers and the top pro MMA fighters. I think that boxers hit with more power and have better chins overall judging the top people in their prospective weight classes.

Boxing only has to worry about punches, MMA has to worry about takedowns, kicks etc. their punches are part of a larger game plan. So boxing dedicates their whole training program to hitting fast and hard with their punches. MMA is going to be divided up in their training time. Seems logical that a person who dedicates themselves to one skill would be better at it than someone who doesn't.

As to their chins. To make it to the top of the game in boxing you can't have a weak chin, they have a longer amateur career before ever stepping up to the pros and then trying to make it to the top as a pro. An MMA fighter usually has a shorter amateur career and can overcome a weaker chin with their clinching and ground game and avoid standing toe to toe with their punching and can make it farther in general.

 

I'd say a big difference, power comes in to it but its technique as much as anything. MMA fighters have to concentrate on multiple areas in their game, where as a boxer has all his training time covering punches and technique more intensely

 

I'd say in general I'll take a boxer as a puncher over an MMA fighter. However, that's not the whole story. MMA fighters make use of techniques that boxers do not. A few examples:

1) Russian casting punches. Seems to me that in a boxing ring they might get you countered and lit up. However, there's no denying that a casting punch hits tremendously hard. Here:

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2) Falling punches. Hello, Dan Henderson:

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3) Spinning backfist:

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Hand wraps are the biggest diff

 

Boxers hit way harder with the fist then MMS.
Boxing gloves were only designed to protect the hands and people forget that .