However, Hernadez netted a brace during United's 4-1 FA Cup win over Fulham on Saturday while Rooney also got on the scoresheet, and Jones believes that the boss has a difficult choice to make.
"All credit to Robin. He has come in and been unbelievable for us this season," said Jones.
"He has got lots of goals. But we have got other players who are just as good, as Javier and Wayne proved against Fulham.
"With four strikers firing on all cylinders at the moment the manager has got a tough decision who to play."
United host Southampton in their next match on Wednesday.