Based on performances alone, Park has to win it. I don't remember a single good match he's played. Zamora was our third top scorer, Hill has had the odd good game, Mbia has had his moments, Bosingwa played well after his return, even Granero and Hoilett had 2 or 3 games. Someone tell me one game where Park has played well (an average second half at Southampton doesn't count).
Pointless to pick on individuals, last season was a collective failure on a massive scale. Both managers should shoulder the majority of the blame, allowing players we know are good, including Park, to perform way below their potential with no motivation, discipline or empathy with each other. The players are responsible for their own performance, the managers accountable for the whole.