Gaucho,
I am not certain that my Henderson Gold 3mm keeps me warmer than any other 3mm, BUT it is certainly easier to pull on when wet! Since I generally like to take my suit off between dives--or, at least, slip the top off--this is a very desireable feature.
On the down side, though, the Henderson has torn twice near the seam for the knee pads. I have repaired both tears with thread and repair compound and neither repair has come undone. Note, though, that now I am very careful when pulling on a leg near the pads!
I have talked other divers with suits that are bonded with other "easy-slide" polymers(e.g., Harvey's that Warhammer referred to) and they seem to have the same easy-on effect as the Henderson. My guess is the best bet is to try various suits on and go with fit and price.
Joewr