Hi there !I'm a ninjitsu (koga style) student and I have started Iaido classes last week... ! But I wish to learn how to really fight with a katana and some people say that I should do kendo and other say that it could be better with kenjutsu. Well... I really don't know the difference between these two so if someone could tell me which one is better for what I am looking for it would be really appreciated. Thanks for the time you're taking for me and sorry for all my mistakes, I'm not perfectly bilingual... hehe!!
Simon

What style of Iaido are you studying? You may already be studying a fully functional sword style. And what do you mean by "really fight with a katana"?

Are you looking for a battlefield style? A dueling style? A streetfight type style?

Kenjutsu is a very generic term which encompasses all styles of Japanese swordsmanship.

Kendo usually refers to a very specific organization. It is more sports oriented than the older schools of swordsmanship. That's not to say it isn't a worthy pursuit. It just isn't an old school of swordsmanship.

Be patient with your current training. Ninjutsu (all forms) is very detailed when it comes to the sword. I have taken Togakure Ryu Ninjutsu (Bujinkan Dojo), and we trained heavily with the sword. I would suggest that you get as much as you can from your current training before you run off to another dojo.

Not to mention that most traditional Kendo or Kenjutsu dojos will only train you to be right hand dominant, whereas Ninjutsu will stress using both hands and unconventional gripping techniques to make sword fighting more powerful.

Happy Training!