Opinions can be based on anything, they are opinions, it's subjective they will be all over the place. Some people will always point to super bowls to shut down anyone who does not have one. People will cut it any way they can to make their point. Only look at first two years, bam Herbert looks better than Allen.
If you look at Watson, they both have 4 years of stats and from pure passing numbers you can definitely make an argument for Watson. If you look at win/loss then Allen looks better. Allen has great postseason stats with the one caveat of the game in Houston when Watson brought them back from 16 points to win against Allen.
Dont take any of this as my opinion....I dont really care about who ranks QB's where, I want the Bills to win Super Bowls.