I voted for the Serie A 'cause the way I see it, they have a great system with cooperation between the clubs to keep Italian and Sammarinese players in the league. Besides, my favourite club (Juventus) and the current Euro Champions (Internazionale) play there :S
basically they aren't full fifa members 'cause they're not actual nations, just national teams. Zanzibar is part of Tanzania (I think), and French Guiana is an overseas territory of France :P