I’ve always believed Joe won all three bouts.
How could Frazier have he won the third fight when Eddie Futch stopped the fight between the 14th. and 15th. round?
The outcome of the third fight isn't a matter of belief or opinion -- Frazier quit on his stool after the 14th round from exhaustion, and Ali was battering him at will at the time of the stoppage. As I mentioned earlier, probably the best heavyweight championship fight ever.
The second fight was a very boring affair with Ali winning easily on points -- no controversy. Frazier had a particularly bad outing -- he just wasn't on his game.
Frazier beat Ali only in the first fight, and that was a very close contest.
I was rooting like crazy for Frazier to knock Ali's head off in all three contests, but alas it just wasn't to be. The best moments Frazier had against Ali were the famous knockdown (left hook) in the 15th round of the first fight and the middle round (7th through 12th) pounding he administered the third fight.