Isn't the off-season great? ?
Rex definitely had a better deep ball than Trubs, but he also had a much better deep-ball receiver. Berrian had genuine long-speed. I'm not saying Gabriel doesn't, but Berrian used to routinely get behind DBs and I just haven't (yet) routinely seen that kind of separation out of Gabriel, possibly for release reasons. With that being said, Trubisky has not (yet) shown a consistent ability to hit guys deep when they are open. I'd rather have Trubs though as I think his arrow is pointed up.