Same here - I have some T4 material, a little MegaT, and one TNE equipment book - but there is more in those rule-sets that I dislike than there is in CT - and conversely much more I like in CT than in any of the others.
Call me a grognard - I learned CT in 1983 while in the USMC, and it just suits me (plus all of the CT-specific stuff I've created for myself that would NOT fit in the other rule-sets).
And yes, I'm dealing with a much earlier setting - my home-created version of "what happens if the Interstellar Wars between the Terran Confederation and the Vilani Imperium sputtered down into a cold war instead of a Solomani victory"? Pick things up a couple of centuries later, and there's my setting.