I think if with "better" you mean all around combat sport, then I would have to say it's a fact MMA is better.
If it is ment on pure entertainment level,then I would say that is totaly opinion.
mma is cool because it is in relative terms more practical to learn to addapt to the situation.and modern boxing is stupid it is like 8 2 minute rounds so the endurence aspect is less important and it is more complex to avoid punches,kicks,knees,elbows.it is easier to box as a boxer mma is difficult to say the least. a mma guy can beat a boxer if the mma guy is good on the ground
If you want all around then ufc but as far as hand to hand abilities you get more from boxing. Styles like in-fighting, outfighting, speed-fighting, boxing, brawling, counter punching. A boxers punching ability is on a completely different level than even a ufc fighter. You dont really see how different til you see them on the street. Funniest thing I will every remember was I saw a dude 6.2 300lb challenge a 5.6 140 pound prize fighter. He starched the dude on the first punch. Zab Judah has done that to a couple of big dudes as well.
I like the UFC as much as the next guy, but boxing is about a million times more exciting to watch than most MMA matches. The majority of MMA matches boil down to a few seconds of fighting, and then one fighter leaning the other guy against the cage, or laying on top of him for four minutes.
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Equally boring are boxing matches where the two guys just dance around for 12 rounds. You see, any combat sport can be boring when the two guys don't actively engage each other, and just play grab-ass. Besides, MMA has rules that do not allow for inactivity. And that tends to happen more in one-style MA tournaments/fights, especially grappling ones. BJJ tourneys where they wear gi's can be boring as hell, and too often they just lay there playing patty cake. But that's actually systematic, because they're often coached to be passive and wait to capitalize on mistakes. Though, in general, I think striking is much more exciting to watch than two dudes rolling around on the floor. I'd rather watch a pure Muay Thai or Taekwondo fight over a BJJ match any day of the week.
In entertainment, its purely opinionated, but I would easily say mma. Boxing is too slow, its technical but just to slow. They punch a lot and not much happens... knockouts do happen but they dont come as often as I would like, especially at the professional levels, and even then when using your hands the knockouts can only be so different.
MMA has a lot more variety, and (as already stated) has much more too it. Pretty much every fighting style is incorporated, so it obviously takes more technique in more categories, and watching someone get slammed on there head or superman punched to the face is a lot more entertaining that "jab jab clinch jab jab hook".
No, by light years ahead, he means that boxing is the most limited form of combat sports. It's fun to watch, but Floyd Mayweather isn't stopping Dominick Cruz from putting him on his ass with the philly shell defense.
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