Floyd could be the best of this era, hes pretty much untouchable but has avoided 2 - 3 guys who, in their primes, could have caused him serious damage. Its all theoretical and opinion based, some guys will lean towards fighters because of their own allegiances, or because it is popular opinion and they cant think logically for themselves.
I would have loved to see Leonard v Mayweather, stylistically i think they match up very well. But back on point, its hard to look passed him right now as there really arent alot of guys throughout the divisions that have his level of technical ability. They may be faster, more powerful etc but he puts it all together better than everyone just now.
one for the future (even the present), and if you havent heard of him or watched him fight then please do so, is Carl Frampton. Very exciting prospect! Kell Brook will also dominate once he puts the arrogance to one side and focuses 100% on the task at hand.