Hello!
I wrote a fairly extensive article about the current GRE vs. GMAT on my website, and it is still relevant in some aspects for the new GRE. Since you're applying to an MBA program it is likely that that GMAT is the better choice as stated by the above comments. However, for other people reading this comment the choice may not be so clear. You should consider taking the GRE if
1) Your school tells you they prefer the GRE. This is often the case for people applying to certain masters programs and PhDs (including some Business PhDs.)
2) You took the GMAT several times, didn't make any improvement, and still have a low score. In this case taking the GRE offers you a clean slate.
If you want to see the differences between the current GRE and GMAT you can read my article at
https://www.standardizedtests.org/content/gmat-vs-gre
Cheers!
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