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)
Flashback Team: RomHack24 — Flashback Team

Can you help me choose?