Hello everyone Which is better? : Online tuitions by brands like: Meritnation, Myschool page or Catalyze or regular tuition classes?

Regular tuition classes is always better..dt too one to one. Online one to one tuition is also  a good option. Brands like fitjee etc are team and moreover it's not a place where every student will get benefitted. It's like attending another school after ur regular school. Sometime it creates unnecessary pressure as it is v difficult to cope up with their studies. They have their own assignments, exams etc. 

Regular classes are always useful. Home tuitions are better than classroom coaching. Classroom coaching is better than online courses.
Online classes are better when capable tutors are not available near to you. Advantage of online tuitions is we can select the best tutors around the globe (world).

My suggestion would be, not to follow a brand particularly, instead, experience and contemplate, whom you are comfortable with. Some students work better in a group; they find the company encouraging and the healthy competition among students, motivating, whereas many individuals cannot open up in a class, and is more comfortable in private lessons. For students who are weak in a specific subject, you should opt for individual classes, that can be both online and offline. 

One advantage of online classes is that you find capable, experienced tutors from around the globe. It doesn't limit your option, and you get to encounter and enhance your skills to the best of your abilities.

Both of them have their advantages and disadvantages. It comes down to how a student puts effort into studying. You will achieve the same results according to your energy. But online classes have brought in some features which will help you learn things with different perspectives of teachers around the world.