Best ever is tough. Which is better? Apples or oranges? Having said that, I could make a case for SS/SS2 or UU. But, for me, it was W8. It still holds up today. It is really the only blobber that got it right with free form movement/exploration but with turn based (the game calls it phased) combat. Combined with a semi-open world, party NPCs that are fun and have distinct personalities. It is complex but can be as tough or easy as you want.