Is debian Trixie relatively stable at the moment -- official release is still a little while off yet.
seems so far to perform OK -- running on an external 1 TB NVME stick (USB->nvme adapter) - the download was a bit confusing as it still said Debian 12 on the download (netcd iso install) but was definitely trixie after install. KVM/QEMU working properly. Haven't tried VMWare though.
Incidentally for better video etc install the virtvio tools on the Windows guests --get from the FEDORA site. Any version after 221 OK -- otherwise you'll get a Windows signed driver error and have just the basic Ms display driver on your windows guests.