Looking for a minimal distro for a virtual machine

Hi all :)

I manage a handful of websites and their emails using the PortableApps suite on Windows, so have a separate browser and mail client for each one. This has worked well for years, but now I'm switching to Linux, Mint specifically. I've read that I can set up profiles on Firefox and probably Thunderbird, or maybe run separate instances with things like AppImages, but it sounds like it's a messy solution, and could end up with me using the wrong profile by mistake

What I want to do is set up a virtual machine for each site, and have a completely separate instance of the programs, and hopefully a way to easily transfer the machines to other systems if needs be.

I'd prefer to use a Debian / Ubuntu based distro with Apt and the 'Windows' style desktop, as that's what I'm already used to, but am I better off installing Mint and stripping it down, or is there something more suited to this?

Thanks in advance :)