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good question, but it completely relies on the task at hand.
for example, this year, alot of power and speed was necessary to push bins and robots around. therefore the drivetrain is very important. in past years, i.e. 2001, you did not need to worry as much about being strong as you would need to worry about manipulating the large goals and balancing, as well as placing the large ball on top of the goal.
even in real life these hold true, for example there are arms that can mesure out and perform scientific experiments thousands of times more accurately than any human. On the same hand there are big Robotic Crate lifters that move shipping crates around a dock and onto the right boats. these need to be made stronger and reliable, not quite as accurate tho.
i hope this helps you.
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