Strava is compatible with Stryd and you can export your activities from Stryd to your Strava account.

Make sure you are only exporting data from one account to Strava. If your watch app is pushing data to Strava, then you will not need to pair Stryd to Strava. Otherwise, you will have duplicate data on your Strava account.

Now your Stryd data will automatically be pushed to Strava!

Yes! Strava does support running power when recorded with the most popular sports watches and contained in FIT & TCX files.
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When an activity is synced from Garmin, Polar, Suunto, Coros, Apple Watch, or the Stryd mobile app to Strava, you will be able to see a graph of your run power in the Strava mobile app.

Discrepancies between Stryd and Strava can occur because of the difference in data processing between the two programs.

Stryd uses 3-dimensional motion capture and changes in barometric pressure to determine pace, distance, and changes in elevation.

Strava "takes the distance data recorded in the file and parses it into a data stream to calculate total distance, average speed, and max speed." Here is the link to the Strava web page where they talk about the "Pro's and Con's" of their data presentation method: https://support.strava.com/hc/en-us/articles/216919487-How-Distance-is-Calculated

Strava runs a calculation on the GPS coordinates as recorded by the GPS watch to get the distance. This means that Strava may determine that the distance is different than what is shown by the watch (and in the Stryd ecosystem).

Strava does not always measure hills accurately. Strava uses GPS points and a flat path is assumed. Here is what Strava has on their website, "A flat surface is assumed, and vertical speed from topography is not accounted for. Similar to the above, straight lines connect the GPS points."

Stryd has better accuracy on hills and mountain trails than Strava because Stryd can measure the line called "c". Strava can only measure the line called "b".

This is an image of a right triangle and the road is represented by the line called “c”. The elevation would be measured by the line called “a”.