Mine, of course, but I’m biased. 
Assumptions I will make:
- fight that must occur, cannot be avoided, neither fighters wants to flee/escape
- all fighters are very accomplished and have trained to use their respective techniques to maximal effect and have trained diligently so that they are available under combat stress
- No weapons, this will be an empty handed affair
- It is a standup fight. Both combatants start aware of each other and the other’s intent
- I’m going to run this as a pseudo-tournament, single elimination (p.s. - until round 3 where I switch to Round Robin to be fair with a bye to the final)
The problem with this debate is that the waters of modern martial arts are too muddied. Instructors vary widely within the same style. Most styles are pretty much teaching blended arts. I know several TKD schools that are now teaching basic grappling! :eek: As an aside, there is a lot of grapples and throws hidden in kata with a Korean origin so this shouldn’t be as surprising as it probably is. Picking a style that would over all others is pretty impossible now, although certainly any style which has a blend of techniques is going to have an advantage. Pure grappling is great, until you get stuck in a punch/kick fight, and striking is great until your opponent grapples.
So, lets take a little trip through time. Using historical combatants who would win. Lets go back to 1680 AD, a kind of golden age for ancient martial arts. We can safely ignore most peasant arts. Contrary to popular belief, they were not designed to allow peasants to win against the warrior classes, they were designed for village defense against bandits and raiders. So that leaves us with the warrior class arts.
So from China we have the Shaolin. Although there were lots of styles of kung fu or other chinese arts, they were largely peasant class. The Shaolin were called warrior monks for a reason. They fought in wars so I’m counting them as warrior class.
From Japan, we have the samurai and ninja. The samurai were primarily interested the bow and the sword, but for empty handed fighting they used jujutsu. The ninja obviously used ninjitsu.
From Korea, I’m going to take the Hwrang-Do. Okay, the sociey had died out about 1400 AD, but close enough.
Vietnam. Only one to pick from for this era. Vo Thuat.
Philippines/Indonesia Kali/Silat.
Thailand. Only one to pick from for this era. Krabi Krabong.
Africa. Only one to pick from for this era. Capoeira.
India. Only one to pick from for this era. Kalaripayit.
Russia. Only one to pick from for this era. Sambo.
So I determined a random number for each so I can do some pairings. So the final list in order:
- Capoeria
- Kali
- Shaolin Kung Fu
- Kalaripayit
- Jujutsu
- Krabi Krabong
- Vo Thuat
- Ninjitsu
- Hwrang-Do
- Sambo
Capoeria vs Kali. Kali wins. Capoeria was included to be fair to other martial arts that originated in that era in other places in the word, but really Capeoria is a peasant art. It is designed to be used when at a severe disadvantage and does what it does well. Gives a last ditch hope to fight; however, it simply not able to overcome it self inflicted handicaps.
Shaolin vs Kalaripayit. Shaolin wins. This is a good solid matchup. However, Kalaripayit focuses on pressure points strikes and as such loses in the long run against the direct, constant pressure applied by Shaolin.
Jujutsu vs Krabi Krabong. Krabi Krabong wins. The samurai would rather carve up his enemes. Jujutsu is of last resort or when his sword isn’t handy. Plus, there are tactical problems for jujutsu vs krabi. If the samurai can get a lock he wins, but how often is he going to be able to do that against a similarly skilled opponent? Unable to lock it up on a consistent basis, the samurai loses statistically in the long run.
Vo Thuat vs Ninjitsu. Vo Thuat wins. Forced kicking and screaming into a standup fight the ninja loses. I know the ninja weren’t helpless when it comes to fighting, far from it, but a style dedicated to that kind of fight vs one that isn’t results in a loss for ninjitsu.
Hwrang-Do vs Sambo. Hwrang-Do wins. Hwrang-Do is a complete system, Sambo is not. Statistically, Hwrang-Do will win out.
ROUND 2
- Kali
- Shaolin Kung Fu
- Krabi Krabong
- Vo Thuat
- Hwrang-Do
Determined bye at random… Vo Thuat.
Kali vs Shaolin Kung Fu. Shaolin Kung Fu wins barely. A very good matchup. However, alot of Kali training is for weapons so this puts it at an immediate disadvantage. Other than that the styles are very evenly matched. Both used advanced concepts coupled with effective technique. In a long drawn out match the slight disadvantage.
Krabi Krabong vs Hwrang-Do. Hwrang-Do wins. Ultra-aggressive Hwarng-Do overwhelms Krabong while it tries to figure out how to use its control elements. It is a good fight, since Krabong is not defensive but has a good spread. But it is defensive enough to lose out in the end.
ROUND 3 (Round Robin to be fair)
Shaolin and Hwrang-Do defeat Vo Thuat which is far to defensive in nature to survive.
ROUND 4 (The Final)
Shaolin Warrior Monk vs Hwrang-Do warrior. An excellent match. Both styles are complete and effective. It really could come down to coin toss. Shaolin is more complete, and in philosophy is more advanced. Hwrang-Do is complete but doesn’t try to control the fight as much, but is more aggressive. If it were average fighter for each, I think Hwrang-Do would win; however, since this is a fight of the accomplished I think the advanced tactics of Shaolin prevail.
So the “best” martial art is clearly Shaolin Kung Fu. QED. 
Yes, this should be taken pretty tongue-in-cheek.