Has anyone here tried any of those? Animsquad, AnimMentor, Animschool, Ianimate And which one do you think is better based on our level?

If you want to be really great animator !

all sites are good because all based on education purpose only but according to question i say "animschool".

I know many people who tried AnimSchool. Most of them worked with SunRise Stuidos and Disney Studios. They have a very good instructors that can lead you to the best ways of doing the character animation. They ask you to do a task and when you do it they check your work and show you where is the mistakes you made and what is the best ways to correct them.

Very recommended.