Hum, first, I want to say that I haven't skied that 2 skis so all I'm saying is from what I heard.
If you do a lot of rails, T.Hall is better cause it has special jib edges. T.Hall is also softer than Ar5.
Maybe Ar5 is a lil' better on jumps because it's stiffer.
Take a 176, because I think you will mount them true center (or close to it).
I'm trying to help, but wait until someone who have skied them answers.