My Wahoo Elemnt routinely reports 10-25% less elevation than the Strava corrected. I do loop rides and the start and end elevation are often different.
On the flip side, when using my speed sensor the Elemnt final distance is roughly 1-5% higher than Strava corrected. I measured my tires rotation with chalk and like 5 rotations and my circumference is consistent with the charts. When using the Elemnt GPS speed/distance and not the speed sensor, it is ±1% and very close to Strava corrected.

I usually just let Strava correct it so I at least have some consistency over time.