Ah well... one of those questions it's almost impossible to give a single answer to.
Two recent favourites...
- The Metropolitan, Bangkok - breakfast at the Glow cafe; very quiet, with an a la carte menu and great service. Perfect coffee, and an intriguing mango-smoothie-thing.
- Amanjiwo, Java - breakfast in the restaurant early in the morning (I was the only person there), watching the sun rise over Borobodur. The best pancakes ever.
I suppose the ambience of the place (the quieter the better) is a big factor for me, in terms of 'best experience'. I don't tend to have more than a coffee and some croissants and some curious fruit for breakfast, so am not really as won over as hotels obviously hope one will be by those vast buffets...