I think the Huge/Deft are in a different school to the Expert/Slimblade/L-Trac/T50.
With the latter school, I actually prefer the Expert to the Slimblade (not tried an L-Trac), as the palm rest is more relaxing, and you don't have to float. The latter school also allows you to manipulate the ball with your palm, which I personally find more precise and quicker then using my finger tips.
That said, for more general use I find the Huge (not used the Deft) more relaxing, especially with the extra customisable buttons, which means less movement.
So I actually use both, Expert in the left hand and Huge in the right hand, and switch between the two depending on what I'm doing.