I'd be wary of buying from Purism. While they have great (stated) goals, they have a track record of not shipping devices on time, etc. etc. Not to mention the Librem 5 is $1K for a chunky phone with just 3 GB RAM and 32 GB storage.
The Pinephone meanwhile is underpowered and barely functional. The Pro? Barely functional still.
Even on (outdated) Mobian stable (that is, Mobile Debian), my Pinephone Pro is fast and stable enough to be my daily carry. And has been for some time now.