Why can one TTS model lead one metric but not another?
Speech quality has several dimensions. A system may pronounce words clearly while sounding unlike the intended speaker, or produce a convincing voice slowly. Multilingual results also depend on language-specific data and scoring methods, so a single ranking cannot represent every product need.
Answered in
The Voice AI Leaderboard Has More Than One WinnerSpeech systems need to be judged across intelligibility, voice identity, speed and language fit—not a single leaderboard score.
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