Both have high-quality GRE prep courses available to you. That’s why they are so popular.

In terms of study material alone, I cannot say if there is a huge difference between Galvanize and Magoosh - although, Galvanize has been known to have superbly high quality Math questions (which is why you will read so many reviews of students saying Galvanize Math really helped them do well on the test)

I think it will come down to the OTHER aspects of their products - think about how easy it will be for you to get explanations for any doubts you will have, think about if there is somebody who will oversee your progress, think about how much feedback you will receive after your tests. These elements should help you decide between the two options.

Of course, another easy way to decide is to read reviews from other students like you - Which is the best GRE Online Program: Magoosh, GRE Edge, Crack Verbal, Chalkstreet or Galvanize test prep?

Note: I am partial to Galvanize Test Prep myself simply because they have so many [url="https://play.google.com/store/apps/details?id=com.entrayn.qbapp&referrer=utm_source%3DForum"]free GRE prep[/url] resources to offer AND because they courses were founded by Indians who studied at universities like Stanford, Harvard, IIT and IIM!

But don’t just take my word for it, read reviews, do your homework and then choose!

Good luck!