Hi,
Thanks for considering our courses! Choosing between a live online course and an in-person course is really up to personal preference. With the in-person course, you get the benefit of a physical classroom, and getting to meet your classmates and instructors in person. With the live online class, you have the benefit of not having to commute, and of being able to log in with your PJ's on if you wanted to. It really depends in which environment you feel you can focus the best in.
As for jordanhendrix's point, you have access to recorded classes whether you choose the online or the in-person option, so that shouldn't be a deciding factor!
What I would suggest doing is attending a free trial, and seeing which you prefer:
https://www.manhattangmat.com/free-gmat-prep-course.cfmLet me know if you have any questions!
Best Wishes,
Caitlin Clay