New Data – Are Experienced Sales Managers Better Sales Managers?

Last week I wrote a revealing article which showed that Sales Managers are even worse than I thought when it comes to coaching their salespeople.  That article stimulated this great conversation on LinkedIn. 
Following that article I dug further into the same 9,000 rows of data to look at the role that tenure and experience have on sales management effectiveness. Who do you think are more effective – newer or more experienced sales managers?