Shall I go for rishikesh or bali
Rishikest for originality.
I've never been to Rishikesh but I have travelled around Bali. Ubud is a yoga heaven and there are some amazing studios there. My favourite was the yoga barn! I wrote a short blog about it, check it out here https://meditatetoliberate.com/2019/01/24/my-top-5-favourite-things-about-the-yoga-barn-ubud-bali/
Enjoy whichever you decide to do!
Rishikesh is the great place for learning the yoga, because it is a birth place of yoga and also known as the world capital of yoga.