So I have been using Tailscale and Netbird and I think the barrier to entry is much lower for Netbird. I find Tailscale to be very complicated and not intuitive. Compare that to Netbird which has a impressive web dashboard that is easy to use. I think Netbird is actually giving Tailscale a run for there money.
With that being said, there are a few downsides with Netbird
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Netbird currently does not have a F-droid app
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Netbird is younger which means that it has had less time to mature. Features like exit nodes are still new
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There are no https certificates. That’s not something I would use but it is worth noting.
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the Netbird client is pretty aggressive under Linux with setting routes and DNS
It would be nice if Netbird could be on F-droid. I tried to work on porting it but right now there is no Libre AOSP Android SDK so building Android apps in a libre manner is tricky.