ZeroDayEngineering Or OSED?

I'm fairly confident in RE and want to get into security research and find binary zero days.
I've done some basic open source trainings, but want to get more serious.
I have my eyes on these 2 courses


Has anyone taken the ZeroDayEngineering course?
[https://zerodayengineering.com/training/universal-vulnerability-research.html](https://zerodayengineering.com/training/universal-vulnerability-research.html)


Or Would the OSED from Offsec be a better choice?
[https://www.offsec.com/courses/exp-301/](https://www.offsec.com/courses/exp-301/)

basic binary course courses cybersecurity find offsec open source research security security research serious taken trainings