Which is better is the wrong question
Every one of these comparisons resolves to a rule, not a verdict. Muay Thai differs from kickboxing by elbows and the clinch. American full contact differs from low-kick rules by one line in the rulebook, and 1988 showed what that line is worth. ONE and GLORY permit almost exactly the same techniques and instruct their judges to reward opposite things. Nobody is better; they are answering different questions.
- KickboxingvsMuay Thai
Kickboxing vs Muay Thai
Two rules separate them — elbows and the clinch — and between them they account for almost every visible difference in how the two sports are fought.
- KickboxingvsBoxing
Kickboxing vs Boxing
Boxers who cross over are usually better with their hands than anyone in the room and lose anyway, because every assumption their footwork rests on is now false.
- KickboxingvsKarate
Kickboxing vs Karate
Kickboxing was invented by karateka, twice, on two continents. The differences that remain are almost entirely about what each competition format asked for.
- KickboxingvsMMA
Kickboxing vs MMA striking
The techniques look similar and the stances are not. Everything a kickboxer does well becomes dangerous the moment a takedown is legal.
- KickboxingvsTaekwondo
Kickboxing vs Taekwondo
Olympic taekwondo scores with electronic sensors and does not reward punching, which produces the most specialised kicking in combat sports and very little else.
- K-1vsGLORY
K-1 rules vs GLORY rules
Same weapons, same tournament format, two small differences in how referees handle inactivity — and those differences select for a different champion.
- Dutch stylevsThai style
Dutch style vs Thai style
One school throws chains of punches ending in a low kick; the other throws single scoring strikes and wins the last two rounds. Both are correct — for their own rulebook.
- American full contactvsLow-kick rules
American full contact vs low-kick rules
One rule separates them, and 1988 showed exactly what it is worth. Everything above the waist is identical.
- SavatevsKickboxing
Savate vs kickboxing
Savate fights in shoes and only the shoe may strike. That one condition removes the shin kick entirely and rewrites the whole kicking vocabulary.
- SandavsKickboxing
Sanda vs kickboxing
Sanda scores throws. That single addition changes how a fighter is willing to kick, because every kick is now a chance to be put on the floor.
- ONE ChampionshipvsGLORY
ONE vs GLORY: two judging philosophies
Nearly identical rulebooks, opposite scoring instructions. One rewards accumulating clean strikes; the other rewards nearly ending the fight.
- Amateur (WAKO)vsProfessional
Amateur vs professional kickboxing
The amateur code has more participants, more disciplines, protective equipment, and the sport’s only realistic route to the Olympics. Almost nobody watches it.