multiple operating systems?

[klick]

I just ordered a PinePhone, and I've been doing some reading on the wiki...  It sounds like it will be possible to get several SD cards, and install a different OS on each card, and then swap OSes by powering off, swapping the SD card, powering back on.  Is that correct?  I'm hoping it is, because it will make it super-easy to try out some of the more interesting (and maybe less polished) OS options.

Is there any particular reason to install an OS on the internal storage (versus SD card)?  Maybe better performance?

So far on UBports CE version, I have been able to boot from a SD both Mobian and Manjaro Plasma Mobil. I used Etcher to install each OS on a different 32GB micro SD card (SanDisk Ultra Plus). I believe the phone automatically boots from the SD first, if available. I am primarily using Mobian on the SD card now an occasionally boot the Ubuntu Touch in order to update.

The only reason I am using Mobian over UT is that I cannot make outbound calls at this point, only receive calls and send and receive texts. This is on both T-Mobile and Mint Mobile's network. Mobian runs slower than UT does which may be due to being on the SD card but making and receiving phone calls, sending and receiving texts, and Bluetooth speakers work on Mobian. Also, the sound quality is much better and louder on Mobian than UT, but this is my experience and may not reflect everyone else's.

I do install the Manjaro Plasma on an SD and try it out when they release a new update but for me, it tends to work even less than the UT version at this time. Based on what I have read, the Manjaro team are pursuing the PinePhone which could really help with development if they can treat it as well as they do their Pinebook Pro project.