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I use a 3441T for travel and a Gitzo 3541LS otherwise. The Feisol is great for my needs, though I only use focal lengths up to 100mm on it and don't need to shoot low often with it. Regarding the 3441T vs. 3442, the smaller spider diameter of the 3441T makes it such that the legs could not fold over most ballheads if it lacked a center column. When stored, the center column is in extended position and legs folded backwards. My 42mm ballhead (Photoclam Pro Gold II dual panning base) just fits between the thinner lower leg sections in folded position, but no way it would fit between the upper leg sections. The whole rig easily fits in the supplied Feisol bag.
I think it really comes down to your needs. If you use it for travel, the smaller diameter of the setup makes a difference when packing the tripod in the luggage. For general usage, I'd get the 3442 for the theoretically gained stability and ability to shoot low without a center column. You do get a bit of extra height with the center column twist-lock on the 3441T even unextended vs. a flat plate. I can use the whole thing comfortably with a D700 without the center extended at all, and I'm 5'11".
Whatever you get, I'd recommend springing for the anti-rotation legs. They're great!