x-men or justice league animated series?  

Which X-Men series do you mean? Is it the old one where the members of the X-Men were adults and included Gambit, or the one where most of the members including Nightcrawler were high school students?

I have seen both the old X-men animated series,and the Justice League animated series ,and though they are both good,I prefer the old X-men animated series,because I love the mutants on that show,and I love how they all have special powers,which makes them outcasts,but they band together to form a team,that overcome any obstacle and defeat the toughest evil mutant.

deffinatley x-men, I just like the x-men since they are born with thier powers unlike some of the other shows where they are gotten accidentaly by radiation or created or just some kind of alien from another planet.

Well, it's a tough choice but I would say X-Men. Somehow, the idea of getting superpowers due to genetic mutation is more plausible than being aliens or something:)