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If we go to the basics, ignoring archetypes and other potentially balance changing optional features, I've always thought this is how paizo view it.
For 9th level casters, how good your spell list and whether you where prepared or spontaneous would determine how good your other class features where.
Core classes only
The Wizard has arguably the best spell list and form of spellcasting in the game, so it has the worst class features. You could debate between Cleric and Sorcerer, Sorcerer has a better spell list but it's casting style is worse and class chasis, armor availability, saves and hit dice, but the Cleric has worst class feature, although the front loaded aspect of domains gives the Cleric the advantage in most games but I think that's something paizo didn't account for at the time.
You then try to apply this formula to other 9th level classes. Take the Witch, best compared with a Wizard, it has a weaker spell list but hexes are suppose to be superior to a Wizards other class features.