TA is considered one of the best two wing defenders in the league. In Memphis, he's totally matured and is a leader who sets the tone with toughness and all out hustle. I would have loved that in Boston the last three seasons.
AB certainly has a bit of TA in him when he makes one or two boneheaded plays a game, like driving one on three and airballing a layup, but young players have to figure out what they can and cannot do in the league.
I wouldn't call TA dumb. In fact, he's smart enough to spend countless hours studying his opponent and smart enough to figure out how how to maximize his skill set to create NAB value. He should garner a nice pay day this summer, something only a handful of players in his draft class could do. I'm sure many of those guys have a higher IQ than TA, but so what?
I'd favor TA if I needed a guy to set the toughness tone for my team and needed a guy to cover bigger wing players. I'd take AB if I needed someone to cover PGs, handle the ball a bit, and hit open threes. AB has a bigger upside, so I'd probably go with him.