I've only seen some film of Garland, but he's got really advanced offensive skills, and should be able to get a clean shot off against anyone. Very tight handle. Super quick, shifty and smooth, with a beautiful jumper. If you want to build around a young core and want a player who can consistently break the defense all by himself, he's a very good choice. Without Kyrie, we don't have a guard who can do this.
It would be a very bold move to trade Smart for him, but if you are going for it, I can see them going in that direction.