
Also, there is no such thing as a 'best' mafia player, there are only players who excel in certain situations/roles. In order to choose the 'best' anything there needs to be a set criteria to judge by, preferably a win/loss ratio or success/failure ratio. This poll is nothing but a popularity contest as is any poll in which you invite the public to vote based on absolutely zero prerequisites.
If you want to make a poll of the best players, do the research and list the player's win/loss ratios, number of games played, etc. and when you're done you won't need a poll, you'll have the answer to your question.