Hi greenskittle,
Of course, the main differences between the in-person class and the live online class is that for the former, you get a single teacher in a physical classroom, whereas for the latter, you get two Instructors in a virtual classroom. The teaching style is exactly the same. More importantly, though, the content is exactly the same as well! You get the same 8 Strategy Guides, 3 Official Guides, 6 Practice Exams, Question Banks, Online Labs, and Class Recordings. However, I will note that one other key difference is that you can make up in-person classes by attending another section, but to make up an online class, you get to watch a recording of the same exact session that you missed - unfortunately, you can't switch into another section.
That's about it! Of course, there is a substantial price difference. The in-person course is $1490 in most places and the online course is $1090. For a demonstration of the online platform, visit this page:
https://www.manhattangmat.com/online-question.cfm. Hope this helps!
Best,
Michael Dinerstein
Manager of Online Marketing
Manhattan GMAT
212-721-7400
800-576-4628