ZeroDayEngineering vs Flashback Team

I am struggling what training should I choose in my goal of finding zero-day vulnerabilities.
Both of the trainers in these courses are Pwn2Own winners that really do the zero-day hunting.


Here are the specific trainings I am comparing:

Zero Day Engineering : [Training: Zero Day Vulnerability Research (zerodayengineering.com)](https://zerodayengineering.com/training/universal-vulnerability-research.html)
Flashback Team: [RomHack24 — Flashback Team](https://www.flashback.sh/training/romhack24)


Can you help me choose?

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