Out of the three games, which one is your favourite and why?

For me, I have to say all of them are my favourite, but I do have a preference to Cataclysm. I think it's because of the time compression feature which speeds up a lot of the boring parts and gets the missions done faster, not to mention that getting a near infinite level of RU's is pretty easy since ships are cheap and there are many RU's early on.