I looked at both and my trade was a 2015 Z71 4wd crew LTZ. Something about the new body style gave me pause, so I went with the 18, which was basically identical to my trade... except the 160,000++ miles. LolI have the 2018 Silverado Z71 crew can, 2.75” lift, skid plates, etc... love it, very capable truck.
That said, if I had to get a new one, the LT TrailBoss, without a doubt.