RHEL 10 announced that RDP would be the preferred alternative to VNC. Red Hat replaced Spice with VNC in Red Hat 8 due to licensing issues with h.246. VNC is under featured and basic compared to both alternatives. Spice uses proprietary h.246 which caused disputes with licenses. RDP is proprietary to microsoft but has a few foss implementations.
Every time I try to use Gnome boxes I walk away frustrated and confused. I thought it was just an alternative GUI that did the same thing as VirtManager. It’s doing something behind the scenes that is very different and not perfermant. I use spice with VirtManager daily and I don’t have issues, but I’m not using the spice webdav stuff either, just display I think.