Are these gaps with Garmin Running Power?

Yes, it uses sensors (not sure what they are called) to measure wind / air pressure through the environmental port. If accurate then this should be more effective than reported wind conditions. 

Thanks for that - that is good to know - that is one of the more important points for me. The treadmill is important, but I don't actually do that much running on a treadmill. In the summer I never do.

Does make me wonder if I should keep Garmin Running Power switched on and let Garmin report and track it's native power, and compare to Stryd power in the Stryd App. I'm not too worried about what TrainingPeaks etc captures as I'm not really using these right now.

For training I'm using Daily Suggested Workouts (HR-based) these past few months and it's been great. Mind you I am using HRM-PRO too. So right now during training power is useful but not essential as I rely on the algos to keep me in the optimal zone.For racing however nowadays I rely on a combination of Garmin's Power+Stamina+Heart Rate. With these I am able to race to the fullest of my abilities while also occasionally surging during the race if needed without worrying too much about completely running out of steam.

I went through the same situation as you -- I've used a Stryd (wind) for a few years, and tried out the Garmin running power (with HRM Pro).  In my case, unless I am on a treadmill, I use the Stryd Zones data field on a separate page to store the metrics for Stryd sync and a ConnectIQ data field that shows power workout details as my first data page with the Stryd pod connected as both footpod and power meter.

I use training plans with power that sync from TrainingPeaks, so I was really hopeful that the Garmin running power would work since it allows me to eliminate the two ConnectIQ data fields and opens those slots for other ConnectIQ data fields of interest.  I did recently switch back to using Stryd (despite the well-documented hassles with the latest Epix firmware releases and Stryd) because of the following:

1) Initially, I felt like the Garmin running power was responsive when it first came out in beta, but lately I found it was delayed when using the workout screen.  Of course, this is subjective, but the Stryd feels a lot more responsive to me, even for slight increases and decreases.

2) The Garmin running power does calculate an "ftp" but there are not a lot of details provided behind it.  While I don't use the Stryd PowerCenter for much, I do like that I can see more behind the auto-calculation of the critical power from Stryd and the power curve.  I will say that from a gut feel, Garmin's calculated running FTP was accurate enough (i.e., my workouts felt correct).

3) Similar to you, I don't use the treadmill often, but when I do the Stryd's ability to tell it that I am and the incline level make the workouts feel more accurate.  I use the Stryd app only when I am on the treadmill just for this reason.

I really wanted the Garmin run power to work for me, and I'll probably try it again in the future to see if improvements they make will help it to be better.  Ultimately, #1 above is the main reason I went back to Stryd, and even just recently upgraded to the new next gen Stryd.

As for the wind, the Garmin run power is supposed to look at the weather forecasted wind direction and speed and adjust, but honestly I never really saw too much impact with the Stryd and its wind measurement except when I was running in to a really strong headwind.  I'll have to see if the next gen Stryd does any better with that.

If you have both Stryd and Garmin Power enabled, both Strava and TrainingPeaks will use Garmin's power since it shows up in the native power field.

On a separate note, the Garmin implementation of running power feels rushed to me.  They took the connect IQ run power data field and baked it in to the firmware without really putting the hooks in place to enable running power generically while using their own algorithms if no external power meter is connected.  It really causes a headache for people who use Stryd.

Wow! Yes, I really need to give Stamina a try! I've loaded up some fields so just need a hard run to give it a try.

Thanks - echo my thought!

I have been using Stryd (wind) as soon as it came out. I have been also wondering about letting it go, and only use HRM Pro. I came to the conclusion I cannot yet:

- Garmin doesn't provide a power duration curve for running yet. This is a critical training tool for me.

- The pace information from GPS and/or HRM Pro is not reliable or responsive enough. Not that the (older) Stryd is that responsive, but more responsive and accurate for sure. I have not been able to calibrate the HRM Pro for consistent pace measurement on a treadmill yet, and yes I follow the Garmin automatic and manual calibration guidelines.

- In a similar way, after manual calibration, Stryd distance is rigorously accurate. On a track, in track mode, Garmin's GPS distance shows some drifts of tens of meters, probably due to alerts or other user interventions that uphold the GPS tracking for a couple of seconds. Meanwhile, Stryd distance is always consistent to a fraction of meter.

- I don't mind having 2 power levels being recorded, and only having access to Garmin's on TrainingPeaks and others. It will take a few months for WKO to absorb the new data and forget the old, but it is OK

- recovering from injury, I like the Ground Contact Balance data field, and find it really useful to concentrate on form

Garmin's addition to native running power seems to be work in progress, and I hope it is actually the beginning of a transition to running power for all the running metrics, including the VO2 estimates, EPOC calculations, and derivative metrics. I am thinking this would be so big a transition that it would only be complete on a new generation of watches.

As much as I would not recommend buying a Stryd when you have Garmin's power, I think the combination of both is still the best option at this time.