Definitely JBL. Going from the midcard to holding the WWE title for 280 days is huge. Michael Cole on the other hand went from being an annoying face commentator to an annoying heel commentator. While Cole's heel work is great, it doesn't make his actual commentating any better in a technical sense. If he's gonna keep up the act, he either needs to tone it down at the table or move on and just be GM or a manager. His ranting often detracts from matches actually.