Why do you want to multiclass?
In general, Pathfinder encourages you to play single classes to accrue powerful class abilities, and this is doubly true for spellcasters like the oracle.
Multiclassing is usually done for a specific gimmick, for example an Oracle of Fire might take one level in crossblooded Orc/Draconic sorcerer to get +2 damage per die rolled on her fireball. Such a character would be worse at everything that isn't blowing people up. An oracle could take 2 levels of Paladin to get their high CHA bonus to all saves and also some other stuff.
If you don't have such a thing in mind I'd stick with straight oracle.