Not sure I like T7-01, looks like they just tried to mate a T3 with Wall-E and stuck a 'Batteries Not Included' alien saucer on top in the hopes it would look lie a tank. (IMHO).
T3-M4 has that 'sitting dog' pose going on that makes him cute (almost expect to see a wagging tail on the little fella) in the same way that R2-D2 has his adorable waddle.