I feel that bossk would have been a solid pick over jawas. His set gives 2 cost units which clearly was needed in this tournament. He is good edge and can get rid of chewy if need be. Also a heat of battle and a possible captur is also good.
Jawas only thing going for them is the twist and the enchantment capture.
I wouldn't say that's the "only" thing they have going. Jawas can potentially lock down and although I never actually used the Sandcrawler it may be decent in certain situations. The other thing I liked is that if I flop Tattoine Crash to start (not my normal choice to do) I only put 1 card there to tempt them to attack it and take it. It basically saves you 1 damage over the course of the game which could be the difference. I was going back and forth between Bossk and Jawas the morning of the tournament and I think it's pretty close.