Depends, but I'd say fire. Drowning... just sucks and what about burning at the stake? No sir. If I was ON fire, then that.
Would you rather:
1)Aliens exist?
2)Aliens don't exist?
(^^ No, not illegal aliens either

)
In both cases, you know for certain that they do or don't.
Ohhh, exists, for sure!!! I believe, I believe.
Would rather live in a democracy where 51% dictates what the other 49% should believe and do. Or, live under a King that is the most generous, honorable, loving King imaginable.