I still have a lot of love for Smart. I think his defense is special. Randle has flaws in his game, but dude definitely has a bright future.
It's tough to pick because of Smart's intangibles and defense, but me personally, I value a player based on what the market says. I personally think Randle has more trade value because he can score and rebound. I mean he could be a very good offensive player if he gets a nice mid-range game. It's possible. I just haven't seen much improvement from Smart and it's concerning. This is really Randle's rookie year.
If you go to BasketballReference and filter by the VORP stat (which stands for Value Over Replacement Player), you will see that Julius Randle's number is absolute last in the NBA.
I'm not sure how that stat is derived, but I've found it to fairly well align with how well players actually play and how much they contribute to their team's winning.
I think it is in part based on on/off stats, another number in which Randle is woefully deficient, particularly on the defensive end.
So, yes, Randle's a great rebounder with some nice skills and some potential, but it's a bit hasty and presumptuous to definitively proclaim him a better prospect than Marcus Smart at this point.
Julius has some growing to do. Time will tell if he reaches his potential. Same for Marcus.