NESSUN DORMA - Great tenor voices compared - Listen to the voce ! ( Voice) Ultimately the decision is up to each listener.
People will always compare voices. Some may like tulips more than roses or lily's more than daises. But the listener must be the final judge as beauty is in the eyes of the beholder. But there are some universal attributes to the voice - as Dr. Pola (Pavarotti's teacher & Franco Corelli and Jerome Hines my teachers)all taught, being a tenor is far more than just vocal technique. It involves the whole spirit, soul & body - the memory, the heart motives, intelligence, authenticity of love, soul weight- stage presence etc.
But technical elements of the voice can be measured. Db levels and sustained can be translated in audio waves lengths on a spectrometer. sound analyzer etc. But ultimately, in studio or live concert hall, the ears of those in the audience can perceive the differences
1. Vocal tone & color 2. vibrato rate 3. Power on top high notes through head voice (the primate scream or "squealo" through the top of the skull - "voce di testa" 4. Proper breathing, vocal control & thrust from the diaphragm - Bel Canto technique, how smooth & sonorous the middle voice, (parlando) etc.
Regardless, its fascinating to compare different tenors by juxtaposing them with the greatest tenor aria climax at the end … VINCERO!