I'd take him over Jones, even though he would likely make mistakes we have a player who has the capability to grow.
Jones and Smalling to an extent are fringe players that offer no development in solving our defensive crisis. While Smalling is a more tidy defender he's not suited to a team who prize possession, this is why he's not even had a sniff under Southgate.
If we had a defender who was competent on the ball it provides confidence in the back four / midfield. De Gea would never have made that pass to Fred and conceded a goal if we had a good distributor, opposition would be more conscious to press from the front because of the spaces that can be exploited, we would finally be able to play through the pressure of a press, diagonal pings into the wide areas (David Luiz / Matip very competent in this transition), it gives us so much more dynamic play in attack.
Instead you have the likes of West Ham, Southampton, Everton, Watford give us intense fixtures because they can commit men forward with little risk attached if they are dispossessed, the same gets done against Pool / City and your looking at the 4/5 - 0's . Solskjaer needs to get ruthless with the centre halves next season before he gets my optimism.