Speed is NOT power. I can think of a bunch of speedsters with no power, and a bunch of power-punchers with no speed.
Speed can be timed and figured out especially if a guy is predictable kind of like Khan Power will always keep you in a fight and you can hit air all night until the one shot comes and saves you You can be taught to deliver your power to a difficult target no matter how fast
speed and weight = power...... velocity and mass = force. Well thats loosely the science of it at least. Sitting down on a punch at the right time it is thrown,coupled with great speed amounts to the TIMIMG of it all. Thats the bit that connects the two elements that amount to power.
Speed all day. You can't hit what you can't see. Plus the other dude isn't going to see what's coming lightening quick punches.
Depends really. I prefer speed but you still need a bit of power. If you throw fast punches in bunches , accurately then you will wear your opponent down by accumulation , but if you got weak power then probably not . Always need to have respect for a power puncher though. One punch can change everything