just got my pair in the mail. Just my opinion, 2011 has some nicer/softer nubuck and materials on the upper. 2015 version hopefully will be more durable.
If you still have your 2011s or can get them DS for a good price can grab a pair in decent condition, I would go that route. I just like the materials more on them because they feel a bit more plush
Def stick TTS, don't go down .5 unless you like a really snug fit.
Will be using my 2015s as beaters for my 2011s.
rather have DS 2015's than some clown trying to charge near the same price or more for some worn 2011's