if you wanted an unbiased response, you should have put this on the MSB. it's going to be 95% Davis on here.
Its a tough call honestly. You're measuring the proven superstar ability of Rose versus the hope that Davis reaches his potential, which is All-Time great in terms of ceiling. Tough call. I'll say Rose
Best Case: Rose returns to dominant form, improves ast:to ratio, and is as dynamic of a PG as the game may have ever seen.
Worst Case: Rose could be Francis/Starbury and out the league in 6 years if Athleticism isn't there.
I think there is still more risk with Rose than there is with Davis and with being 4.5 years older and having one major knee surgery under the belt, it would be tough to take Rose's future.
However, Davis isn't exactly proven and I am not sure he will ever the build of a 5 but he could improve his outside game and become a better KG. Worst case, he is a solid 22 MPG big who can score dunks, hit occasional shots and defend with the best of them.
Either way, 30 teams are happy to have either.