As for PT Yoda vs OT Yoda, PT Yoda was much cockier than OT Yoda. I always felt that his days on Dagobah are what humbled Yoda and made him realize the error of both his and the Jedi ways, and why he teaches Luke what he does. Yoda's reliance on the lightsaber in the PT was a reflection of the time: Jedi were changed from keepers of the peace to outright soldiers and generals.
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TheRock ~ Death By Misadventure, Not Suicide
"Would've liked to see that." - Ayuyu on my boner