Best answer is not answer to you question , One speakers with 85db can sound better them speaker 95 db, Another brand with 95 db will overperform speaker 85db , same thing with impedance and box enclosure design.
dB effeciency vs speaker configuration
I want to know the different caracteristics of speaker. Which one of the following technical data would give better musique, less difficulties to the power amp ? Which would give a better match and sound with stereo tube power amp, and, second with a solid state power amp ? Speaker with air vent, or sealed speaker? Speaker with 4 ohm or 8 ohm ? Speaker with 87 dB or 95 dB effeciency ?