I offered Danny Duffy, Joc Pederson, Luke Weaver, Lance Lynn, my 1st and 2nd round picks for Jose Altuve in the FC. Glad now that it wasn't accepted.
Having the least mileage on his arm is a huge plus moving forward I think. It'll be interesting to see if he continues at this level next season. I'd still take Sale over him obviously because of the track record and like you said it's pretty close between Archer and Duffy where you can even make the case Duffy is a more valuable asset moving forward. Archer is on a team friendly deal though until 2020 with two team options. If Duffy continues pitching like this, he'll get paid.