Probably still Eraqus for a few reasons
1. Eraqus has more experience and wisdom (because he's older)
2. Eraqus is a keyblade master and Sora failed his exam
Sora's exam was rigged as well. And Eraqus fell to his own student. Sure he held back, but he knew fully well what MX was up to. Eraqus could have done something instead of sending his students.