I have two PinePhones and a Librem 5. I mostly use my 3GB/32GB postmarketOS CE PinePhone, running Arch Linux ARM, as I do blog [0] and try to maintain an app list [1] and testing new features or apps on Arch is just way easier, than on Debian (PureOS, Mobian) or on postmarketOS. The PinePhone is slow, but works mostly fine, so does the Librem 5, which is a tad faster spec wise, but generally feels more smooth.
Sadly, on both devices, the battery life is not what it should be. On the PinePhone, active use trashes the battery (no surprise if you have knowledge of ARM SoCs), but it lasts pretty long if you don't use it too much. With the Librem 5, active use is better, but as long as Purism don't implement a standby mode, 8-11 hours is all you get until you need to find an electrical outlet.
P.S.: I also have the Gigaset hardware that the Volla Phone is derived from, and run Ubuntu Touch on it. It's fine, but it does not run a mainline kernel, so it's a different kind of Linux phone and does not really compare 1:1 to Librem 5 and PinePhone.