Question

Is mothertounge the easiest way to express oneself

Answer 1

Yes.... But one should know the other languages also... If you travel to other regions how can you communicate to others

Answer 2

Our mother tongue is the most comfortable language we find while talking to others. You are fluent to talk to someone. It's the best language to express your feelings and yourself as you don't have to think anything you have to speak but just spill it out what's in your mind.
On the other hand we guys find that while speaking other languages we often take help of our mother tongue.