Wow a lot of ignorance and fanboism... Apparently no one has done both.
I have boxed amaturely and have a D1 high school wrestling background and a third degree brown belt in Karate and a purple belt in Akido.
It is a MYTH that boxing has "less going on in the striking game than MMA." 50 year old washed up Ray Mercer showed this against Tim, "the maniac." Tim's friend Jens Pulver had an interview in which he discussed how Tim was making a mistake fighting a boxer, that they are "apples and oranges and two totally different sports."
In boxing you have to focus on footwork, feints, shoulder rolls, etc etc. The stance is different and there are a million "little" things that you have to focus on because it is "just punches."
The striking in MMA is completley different and so is the training. have you seen on TUF the guys trying to hit the speed bag? It is a joke.
Boxers have usually been boxing since the age of 5 and the money and depth of the game has evolved to the point where it is impossible to make it on TV or "big money" without being a tremendously gifted athlete. Floyd Mayweather (who i cant stand) and Manny Pac Man Pacquaio are prime examples of athletes that are just above anything else. There is no way you could have a "show" and then get the boxers ready to compete at that level. They TRIED but were unsuccessful with the Contender. They even had nationally ranked guys like Peter Manfredo Jr but once they got in the ring with the elite....they get DESTROYED. UFC is still in its infancy and doesnt demand quite the level of athlete (because the sport is evolving and the money isnt there). So you can get a good fighter on TUF, train some TDD and he can potentially do really well against the elite (griffin, bisping, evans, florian, sanchez, etc).
While MMA does have more allowable fighting styles and parts of the body to look out for, that DOES NOT mean there is LESS going on with boxing. The sophistication of the boxers style is so complex and evolved that it is ignorant to assume otherwise.
BOTH SPORTS require skill and training....just different kids. People used to say that a good wrestler can become good at MMA due to TDD and ground control. Well good boxers can as well. If you have a high level boxer come to MMA...you can teach TDD and submission defense relatively easy. A BJJ they won't be, but if they keep that fight standing.....watch out. Many of the UFC fights and MMA fights are guys utilizing TDD and striking. You don't see rashad evans doing many leg kicks and he was just a pure wrestler...then he is standing up knocking out some of the worlds best MMA fighters due to boxing. Put Vitali Klitscko in the boxing ring with Lesner and Lesner won't be able to go drink his beer and bang sable. He will be having facial reconstructive surgery. However, put him in the cage and the opposite would be true.
Bottom line...both fighters are bad ass and don't take either fighter lightly. This is coming from someone who trains both camps. peace.