Great choice on the Stryd! You wont’ regret it.
We cover this in the Q&A of Understanding Your TrainingPeaks Structured Workout Plan, included below for your convenience:
Q: My Stryd zones and 80/20 Zones are not aligning in the Stryd app. Why?
While 80/20 uses a fixed duration to determine run power threshold – 95% of a 20-minute trial, or 95% of CP20 – Stryd uses a dynamic method to determine critical power. This could be CP20 for one athlete, or CP40 for another. Therefore, the two methods may not completely align as the Stryd method is fluid. To resolve this, disable Auto-Calculated CP in the Stryd mobile app and manually set your Stryd CP to match your 80/20 run power threshold. https://support.stryd.com/hc/en-us/articles/360057616393
If the run power threshold set in TrainingPeaks is the same as the critical power manually set in the Stryd app, the two applications will align.
See this article from Stryd for more information. https://support.stryd.com/hc/en-us/articles/1500005239442