1. Stick to DDR5-5600 SO-DIMMs. Issues are reported with anything else.
2. Choose standards (JEDEC) compliant modules. Most modules from reputable brands seem to be fine.
3. XMP (Intel) and Expo (AMD) are extra profiles on some modules, readable by BIOses supporting these features. As long as the ‘default’ profile is standards compliant, these should otherwise be OK. In some cases, especially with older DDR3/DDR4 modules the ‘default’ profile was minimum standard specs (eg equivalent to DDR5-4800 - Not good for Framework).
4. Crucial, G. Skill, and Kingston are among the ‘name brand’ OEMs offering DDR5-5600 SO-DIMMs known to work with FW 13 AMD (probably also FW16, can’t be sure til those of us with pending FW16 orders have hardware to test). If you’re concerned go Crucial - They are a Micron-owned company, one of the top 3 DRAM manufacturers in the world. Micron/Crucial explicitly markets their modules as standards compliant.

There’s not much reason to buy Framwork-branded RAM unless you absolutely must have Framework guaranteed compatibility, Framework support, and a Framework warranty on the modules. Going 3rd party from a top tier vendor - As above - Will cost far less for parts which ultimately perform just as well. The primary tricks are to not buy anything other than DDR5-5600 rated modules (for AMD) and to not buy from random junk vendors on a ‘sort by price’ basis.