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AFAIK only per user or per device RDS CAL licenses exist

right, but can you use per device RDS with concurrent citrix? are you supposed to have them match or does it not matter?

I always recommend Per User, but it has to do with the enforcement mechanism. Per User is not strictly enforced. https://social.technet.microsoft.com/wiki/contents/articles/21180.remote-desktop-licensing-demystified.aspx

I’ve always gone per user as well, but where I am now it’s concurrent citrix and per device RDS, which doesn’t make sense to me on the face of it

I think they are two separate mechanisms and can't see why it would matter. As long as both are licensed, and used within the parameters of the relevant license, everyone is happy. (Except Finance Dept..)

Is finance ever happy?