I looked into the Feather for a bit, but my experience with the Pi is much stronger, so I felt more comfortable working with that after I determined the battery I'd need to power it wouldn't be too heavy to lift.
BeagleBoard is similar to RaspberryPi, but focused on embedded robotics vs desktop PC alternative. The PocketBeagle is similar to a Pi Zero. Fully open source hardware. Smaller community though, so harder to find examples/capes.
http://beagleboard.org/boards
Artemis seems to be Sparkfun’s new line of Feather-compatible boards. They target a pro-level audience vs Feather’s edu audience. The OpenLog Artemis looks interesting for logging telemetry.
https://www.sparkfun.com/news/tags/artemis
Artemis seems to be Sparkfun’s new line of Feather-compatible boards. They target a pro-level audience vs Feather’s edu audience. The OpenLog Artemis looks interesting for logging telemetry. https://www.sparkfun.com/news/tags/artemis