Definitely get Davis.
I think it's very tough to decide who to include, Brown or Smart, if Tatum + picks wasn't enough. Like Roy I think we should keep both, but if forced to choose, I might surrender Brown's higher upside and keep Smart. My logic, for better or worse:
-4 starters would be Kyrie, Davis, Hayward, Horford- all mellow dudes. We could use a fiery leader as 5th starter. That's Smart.
-Brown if kept would need to start, and he's maybe the worst passer on our team. I have questions about fit.
-If both players had a low usage rate, which is possible with Kyrie/Davis/Hayward, I think Smart brings more to the table.
-Smart at this point is the better defender and the better shooter, both 3's and FTs (both support the lower usage rate argument).
-I think Jaylen is best at SF and we'd already have Hayward. He can be a starting SG but I think he's a much better fit at SF.
-Smart can play both guard spots, Jaylen is purely a swing/wing.
-In the past 4 years, Jaylen has had 1 good year shooting the 3 (last year, 39%) and 3 years shooting (I believe) under 33%. I think he'll be fine, but that's the same profile as Smart, except Smart's good year is this year (tho he's shooting lower than 39%).
Having said that, if we kept Brown over Smart, I'd happily jump on board. I really like Jaylen and want him to be great.