Jones has the potential to be good at everything defensively, whereas Smallng has trouble on the ball and Evans lacks the natural athleticism of the other 2, but I still have no idea how to rank them.
I'm inclined to think Smalling is the one who looks least trouble by other attackers, so I'd probably have him highest, and he wouldn't be the first great CB to be considered poor on the ball. I think Des Walker was, and Sol Campbell wasn't anything special on the ball. Pepe's not great on the ball, but not noticeably awful either.
It will be interesting to see how the new manager rates those 3, and if he brings in another. Kind of feels like the best course of action might be to skimp a bit at CB by just picking up Rio's option for one final year (He's looked okay the last 3 or 4 games) and letting the 3 young CB's get first crack at starting with nobody in their way, then after a year of evaluation, the new Manager can decide if he wants to buy a starting CB as Rio leaves, or a cheaper, younger reserve CB to back up our new entrenched starters.
Save a bit of money at CB and use it to go get some CM's, an LB and if there's any left, another CM, and if there's any left after that and the new Manager doesn't have some intense love for one of Zaha, Lingard, Lawrence or, god forbid, Young or Valencia , maybe a wide attacker.