The craziest thing about football and why its almost unreal to be able to say the "best" is look at the off season or lack there of. If a club wins the CL, before they even blink their eyes they are reunited with their national team playing in the WC, Euro, etc... Not too mention going to the US or to Asia to play "friendlys". To be honest, the break isn't long to start off with anyways. So you have a team like Inter, who have a great season, win the treble, which not many teams at all have done and then its completely overshadowed by the WC, and then beyond that its overshadowed but the string of bad luck they have had this season. In football, its almost like a what have you done for me lately type of thing in my opinion. To be honest no matter what anyone says, nor argues, you really can't say who is the "best"... We can always have a majority decision but everyones standards and expectations will be different. With the top leagues being as competitive as they are, things will only continue to be more difficult to distinguish. This is just my opinion though, for what its worth.