Tbf Jones has rather been disappointing ever since he came here. He is just 22 but in 3 years he has been here, there hasn't been the kind of improvement you would want to see in a player in their development phase. Jones playing at 3 positions and not in one role with regularity clearly hampered his development. Right now he doesn't look assuring as a central defender and he doesn't inspire confidence when playing there. He has all the tools necessary to become a top centre back but he has to really apply himself if he wants to make it here.
However, Smalling looks like he could be the better centre-back in the near future with his astute tackling, strength, pace and reading of the game. However, he too lacks the commanding nature that most top centre backs have. He does look a bit reserved and 'in his shell' at the moment and hopefully with a regular run in at the centre of defence he can become a top centre back that he always looked like he was going to be. Jones is just 22 and Smalling is still rather young for a centre back and we should stick with them because they have what it takes to make it here.