Oracle
I can finally play a "cleric" as I've always wanted to. I tend to only prepare the same spells anyway. Now I can spam them and have class features that do cool stuff.
Edited for clarification:
Different cleric/oracle characters will have different spells prepared/known based on choice of tactics I want to use and character personality, but for the character I'm playing at that time I will tend to only have the same spells each game day. Playing clerics it was rare that I would change a spell prepared.