Hi,
It depends on the host pool type:
For a Personal host pool, you would use normal Windows 10 Enterprise. With personal host pool it is intended for each user to connect to a single VM, so a single-user windows OS is needed.
For a Pooled host pool, you need to use Windows 10 Enterprise multi-session (or other multi-user windows OS like Windows 11 Enterprise multi-session or Windows Server 2022/2019/2016/etc.). With pooled it is intended for multiple users to connect to each VM, so a multi-user windows OS is needed.
-TP