If you can afford it, I think the Librem 5 is the best linux-first phone at the moment. Both it and the PinePhone Pro are roughly as fast as each other, but the Librem 5 has a much more premium feel, and the hardware kill switches are much more accessible, if you're into that kind of thing.
Back in the day, when the Librem 5 was $1000+, it was a no-brainer for the PinePhone Pro, but I feel it is much more reasonable to recommend the Librem 5 now.
You can make it work as a daily driver, but I wouldn't want to depend on it for life and death situations. Calling generally doesn't work very well - either one side can't hear the other, or the audio quality is too quiet, or not very good. It's probably possible to fix if you know what you're doing, but I don't know what I'm doing :)
I carry around a dumbphone and a SIM removal tool, so that I can call someone if I really need to. If you're happy to do that, I feel it gives you the best of both worlds.
Otherwise, one alternative is to be an Android-first device, that has good support in PostmarketOS, e.g. the Oneplus 6/6T. Mobile Linux has had such an impact on these devices that the price of these on eBay has gone up in some areas over time :D
@ambitiousslab It's probably PipeWire. AFAIK nobody adjusted the audio pipeline to work there with echo cancellation and noise reduction yet. I wouldn't consider it suitable for phone use until that happens. It's not rocket science, PipeWire is actually more flexible than PulseAudio for this kind of stuff, but... someone has to do it. Switching back to PulseAudio and reproducing the config from PureOS (including ALSA UCM profiles) would likely give you much better experience right now.
@ambitiousslab (I have to admit that it's partially my own fault; I have reworked L5 UCM profiles from the ground up long time ago, but neglected upstreaming them and now there are flawed profiles in upstream repos ☹️)
Thanks for explaining some of the history, it makes some sense and gives me some things to try.
Thanks for all the work you've done on the mobile stack as well. It's made my life a lot better. And maybe one day I'll be able to ditch the backup nokia too :)