It depend which part of the world is more convenient for you to go and what lineage is your target?
I can only recommend India schools which
will teach you Yoga philosophy as well Asana practice.
For Hatha - Rishikesh (Here you need to do some Research).
Better go to Rishikesh and try drop by classes. Which will give you a broad real life perspective.
Below are cult / lineage based which are all sub stream of Hatha Yoga :-
For Krishnamacharya (Vinyasa, Desikchar)- Chennai
kym (dot) org/yoga-teacher-training-pgm-15-17 (dot) html
For Ashtanga (Pattabhi Jois) - Maysore
For Iyenger - Pune
For Sivananda -
Further you can also call below Institutes/Ashram which might also
be a treasure for you
Om Tat Sat