If I for whatever reason ever found my self in a sanctioning body, having to vote on this subject, I would undoubtedly go with 12 rounds.

If I have to vote as a fan, I am not so sure, even if we disregard fighters' safety for a moment.

On the one hand most great 12 round fights would be even better by going 15 rounds. We all remember some of the great 15 rounders of the past, and we could all name a bunch of recent fights we wished would have gone on longer.

Considering how many fighters that seem to have problems with stamina even for 12 rounds, it would however not be unfair to say that some fights would be significantly worse if they had lasted 15 rounds. I mean, how many people here longed for 3 more rounds of Hatton-Urango? Or if fighting 15 rounds means fighting all rounds at a slower pace (adjusting for stamina), then how many people would even be capable of sitting through your average John Ruiz-fight?