We are currently on Server 2019 hosts 8 vCPU/64 gb RAM with user density of 9-10 per server (for comfortability, can squeeze more on them if needed), FSLogix Profiles, all in Azure. We plan to upgrade to either Server 2025 or Windows 11 muti-user, with a plan to test out both. Just looking for peoples opinions on both OS's in 2026, if one is preferred over the other, what you are seeing for user density, etc. Thank you!

OS gets newer, your density gets smaller

Server 2025 in my opinion works better than Windows 11 multi-user.

Don't suppose you could go more into detail? Is it the applications? or performance? or just handling multiple users or?

Server OS over Desktop OS for scalability...

I kind of assumed that was the case, which means if we had any potential cost savings from the licensing of W11 muti-session it may be outweighed by needing more hosts anyway..

When Win10 was released MS went out of their way (with the help of a lot of bloggers eager to be on the MS good-boy-list) to convince people that Win10 multi-user was the best way forward.. of course it wasn't better, more scalable, lowering TCO, and whatever.. Server over Desktop always.

I think that the "multi-user extensions" just aren't "proper" RDSH. But Microsoft were so determined to get rid of the Windows Server non-headless SKUs (I read somewhere that RDSH and something else where the only two features that still necessitated Windows Server to ship with a GUI). Ironic really, when they pushed "Windows Server" so hard in the 90s even though many in the industry saw it as an oxymoron

100%

can’t you do rdsh on 2025 core, no gui? Has anyone tried it?

Only for admin accounts. Not for multi-user.