Hi and welcome, we have towed several TT's, never a 5er, and can attest to how well the AS tow. Very smooth ride. My 25 tows better than the popup we had years ago!
I think you will find towing an AS to be much more economical than the 5er;much lower profile means better mpg! (and less turbulence)
Assuming you already have an HD truck, you won't need a HA hitch either. Equalizer or Reese will be more than adequate.
I don't think you can go wrong-you will have less basement storage with the AS though...but I am sure you already know that if you are considering a TT.
One thing for sure; the AS community is great!
What a wonderful, and helpful group of folks here!
*Life is Good-Camping all around the Continent*
*Good people drink good beer-Hunter S Thompson*