Yeah, I only believe in "best FIT" for the individual.
In terms of overall pure sound quality, the possibilities are endless because you could always add subwoofers to any speaker and because everyone simply has different preferences.
Some people must have that Martin Logan or Magnepan sound, while others hate it.
Some people prefer traditional direct radiating box speakers, while others hate it.
Asking for the absolute best speaker is almost like asking for the absolute best food.
So "best" needs to be qualified by certain parameters.
I mean honestly, even if I were a millionaire, I would still buy the RBH SX-8300 (MSRP $5K) over the Revel Salon2, KEF 207/2, B&W 800D2, etc.
However, if money is no object, I think the best speaker in the world is the Focal Grand Utopia III EM because I can actively bi-amp the built-in 16" subwoofer with external amps like I can do with the RBH towers.