I came across the various AcePC offerings and was wondering if it is possible to upgrade the RAM? I see that this is not possible with the AK1, from a previous post, but wondered about the ‘new’ AK3 version (J4215 ones) - which do not seem to be detailed on this site.
Also, do they accept SATA 2.5 drives, like from a laptop?
I guess what I am thinking is, do I buy the cheaper one, see how it works and upgrade the RAM if required...?
Part of me thinks the 6GB should be enough anyway, but wondering if I should just go 8GB. But as this project has escalated from a cheap second hand desktop, I’m trying not to go overboard

It is essentially it is for work purposes, multiple office windows, websites, cloud-based access, to have a dedicated setup and to save keep plugging the laptop into the monitor.
Any advice would be appreciated! Many thanks!