I had the revenge ending first. When I entered the chamber for the first time, I was a little exhausted from playing through the whole game essentially in a single session. (I have to congratulate you! I was so fascinated by the whole game from start to finish, I never found any moment to really take a break.
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I kind of expected an epic boss-puzzle-fight and immediately started to examine the pylons. Since they were unstable, I pushed them over as fast as I could because I was afraid of what would happen, when the orb was fully charged. I was surprised (and also a bit disappointed) when I realized that this was the whole encounter. So the revenge ending was not really a choice for me, but rather my instinct for self-preservation.
Afterwards, I visited this forum and noticed a thread about different endings upon which I immediately restarted the game and watched both of the other ones.
I think, I like the Agrippa ending best (partly because it leaves the most room for some kind of a sequel
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