The main difference could be in the style of animation. One might have more detailed graphics while the other a simpler approach. Also, the storylines could vary greatly, with one having a more complex plot than the other.
There is a new wala story about a girl named Wala. She was an artist. She loved to paint the landscapes around her. One day, she got an idea to paint a mural on the side of the old, dilapidated building in the center of the town. At first, people were skeptical, but Wala didn't care. She started painting. Day by day, the mural took shape. It was a beautiful scene of the town's history, with all the important events and people depicted. Eventually, the mural became a tourist attraction and the town was revitalized. Everyone praised Wala for her creativity and determination.
Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
I'm not sure specifically who this'mba chai wala' is without more context. It could be an individual who has made a name for himself in the chai - selling business while having an MBA background.