well, yea, people here are nice, not like on some other fourms, when i ask something about leg kicks, they are like "hmm..so you wanna learn leg kicks right?…go learn it somewhere, not here"

and they are no fun at all..like when they knew i fight my brother's friends, they were all like " OMG NOOB! you are CRAZY!" but..in a real mma fight..its not gonna be different much , because i might fight ppl older than me by even more than 4 years, so whats their point? idk. i like this forum and site the best mma site i seen and will see.

I come from a TKD background as well, every art has its place in MMA, though some are more suited to it than others.  As others have shared here I think the topic of leg kicks is pretty well covered.  However I am going to just tell you my preference on the Traditional round kick as compared to a Thai kick.  A Thai kick is powerful because its about using your body weight to generate alot of its power, a TKD kick is powerful because of the speed of the kick involved.  Acceleration x Mass= Force.  These two kicks rely on the opposite sides of the equation to generate power.  The Thai kick rely s greatly on the body weight or mass of the kicker to generate its power. The TKD kick rely's greatly on its kick snap of the knee to generate power, so it accelerates at a greater rate than a Thai kick.  Now momentum is a big factor to, to why each kick feels like it does.  Mass X Speed= Momentum. Momentum is  essentially how hard it is to STOP an object with a consistent force once its moving.  Where as force is the "power" so to speak of an object.  So an object can have a lot of force but not to much momentum, though objects that have alot of momentum tend to have alot of force.  So keep in mind that the Thai kick has superior MOMENTUM compared to the TKD kick, even though the TKD kick might have just as much FORCE as the Thai kick.  This allows the Thai kick to go "through" the target instead of transferring alot of force out when the kick first hits.  (Alot of this has to do with people's technique as well, TKD people tend to kick so that all to energy of the kick stops once it hits the surface of the target, instead of aiming a foot behind the target.) So lets recap: A TKD kick and a Thai kick may have the same amount of force because they operate on opposite principles it just depends on the person. However a Thai kick tends to have much more momentum than a TKD kick, leading to better penetration in the target.  Work on the TKD kick to where you are aiming behind the target not at the surface of the target, this will help equalize it as far as penetration goes, but the Thai kick will still have much more momentum. That is just a technique thing it doesn't actually build momentum in your TKD kick it just gives better results because of the distribution of force.  

Understanding all that, I just want to express how I use both types of kick.  I use the TKD kick for the following: head kicks, distracting leg kicks when I'm setting something up but don't want to sacrifice some of the position you loose with a Thai kick.  I use a Thai kick for: Leg kicks, and body shots in general.

Because the TKD kick is faster I use it for shots to the head, it doesn't take much force to knock someone out, and the faster it is the less chance there is that they will block or tense the neck muscles to prevent the whiplash that causes the knockout.  I also feel that a TKD kick is less likely to be caught, and provides me with a better sense of balance on the high kick.   Leg kicks and such I use the Thai kick because of the extra momentum and penetration, the more bone crushing damage the better!    I feel Thai kicks provide a better sense of balance for leg and mid level kicks as compared to a TKD kick.  

So in finality I hope you realize that there is a place and time for both types of kicks, and the traditional is not bad in the MMA world when used properly.  (I still don't recommend 900 degree jump hook kicks but hey :P) I hope this gives you some ideas about traditional VS Thai and that you will start incorporating traditional and Thai at the same time.  Hope this is somewhat helpful ~TCMAG