Dear Aspirant,

Both the channels mentioned by you for the preparation of jee mains and advanced are trusted channels for jee so you can rely on any one of them. Both these have well educated teachers from premier institutions.

If you are thinking of taking subscription then you should take up the subscription of unacademy as they are in the business for a long time now. But if you are watching only you tube videos then I would say go for vedantu. It's much better.