Though I don't share Bolivar's views on VII and VIII, I do agree that IX is the best solely for being the most balanced entry between the three numbered entries.

IX does has its flaws for me but in terms of balancing gameplay with story I feel IX is the best entry in the series and really should be set as the template for how an FF should be designed exempting specialties like Battle Systems and Customization systems. Its structure just works for me.