So I've been using ubuntu server for maybe 3 years.
I've had Debian on the mind about since the start of this year. I ended up making a VM on my ubuntu server, which hosts 2 VM on it. (used to be 3)

As of late I've been thinking about switching my servers main os over to Debian and probably stop running a VM host. I don't do apt-get update and upgrade much, but I did my ubuntu and debian at the same time and samba ended up breaking on ubuntu, even tho it was very fixable (can't share root dir) I needed help to figure it out.

Current server does, ubuntu server, quemu, 2 VM's.
VM 1: samba mysql phpmyadmin apache gameserver
VM 2: samba proxy... think thats it for that one.

I've noticed Debian performed way better, as it had samba and squid3 on it at the same time on 128mb of ram and it never ran into issues. While I had 2 ubuntu vm both 256 or 512mb ram, both of them ran poorly, nearly crashing the VM.

Do you guys think I should switch? I've been thinking about merging them all to one OS at the least, to save disk space.

Thanks,
Higgins909

If you feel the Debian VM outperformed the Ubuntu VM with the same specs, then I don't honestly see why you'd even ask. Given that Ubuntu is derived from Debian, you're going to be totally familiar with the environment already, so I see no reason not to switch if you've seen performance differences in Debian's favor.

I would always advise switching from Ubuntu, especially servers. I don't recall ever recommending Ubuntu for anything.