Hi aspirant...!

Hope you're doing great....!

So, with regard of you're query. There are lots of platforms that are providing you the coaching for JEE  MAINS and JEE ADVANCE. The platforms that you mentioned are one of the top platforms. I would like to suggest that, firstly watch the modules of the lessons in the both platforms( Unacademy  and Physics Wallah) in the you tube. Then, compare the way of teaching in the both. then, pick one, that you can understand easily.

hope this will helps you....!

GOOD LUCK....!