No. Ferrer has nothing over Tsonga.
Not even consistency. The myth that Ferrer is more consistent than Tsonga is, well, a myth. All it takes is for Tsonga to live up to his seeding in Madrid and he will have more ranking points than Ferrer ever had at any point of his career, meaning a more consistent year than Ferrer ever had.
Mark, it is very hard to make a case that Ferrer loses to the players he is supposed to beat more often than Tsonga does over the course of their best years.
Are you actually saying this? If so, I invite you to use the search function at the ATP site and see the losses Tsonga has had and compare them to Ferrer's.