The safe pick is Avery... he is getting more targets than Britt with a better QB.
The upside pick is Britt. He is easily the most physically talented of the two guys, and he can throw up the occasional huge play or two in any given week... but he can also be a bust in any given week.
The answer to your question depends on your needs... if you need a starter or flex option, I would roll with Avery. If you need depth or a one-time starter, go with Britt.
Gordon has been getting a good number of targets and has emerged as Weeden's #1. He has speed to open up the D and has been fairly consistent the last few weeks. Britt is hit or miss, and I think I'd prefer Gordon to Britt. Avery I just dont know about, the Colts do throw a lot, but Wayne is the obvious #1 and I think I'd prefer to have Hilton to Avery and Gordon to both.
Josh Gordon all the way. Avery is dependent on the Colts falling behind in games. Britt has been so so, Wright has been getting the most targets the last 3 weeks.