Thanks all for all your valuable input.
I can conclude from what you said, and my previous experience with the 3 front ends, QEMU is the way to go.
I think I will go for virt-manager I tried it, and yes it has a learning curve somehow but I could actually create a virtual machine and run it. (though it wasn’t that easy as VirtualBox, but it was OK. The beauty of Linux is I am learning something new all the time.
Regarding the gnome box, I am on KDE, I don’t like to install something Gnome that will pull/install Gnome stuf to my system. KDE is KDE, Gnome is Gnome. (This is what I think and what I feel comfortable with).
My use case would be mainly to just create a virtual machine, set it up, the basics I need on it, then clone it to play with the clone, try whatever I want to try, kill the system or break it. It is cloned anyway.
This way, I will be ditsro hopping but without actually doing it. IT is just virtual machines.
I am not at the moment thinking of anything too advanced or complicated like running or networking different virtual machines. (maybe later), but the main thing is to play with whatever distro I want.
Of course the first virtual machine would be my lovely EndeavourOS, will install everything and clone it and play with the clone, perhaps I would clone again the clone. I wil try some other distros.
As you said guys, I think I will be going to add 32 GB RAM (maybe on top of the 8GB) I am thinking of just one chip depending on how many slots I have inside for RAM chips, just in case I need to add more later.
Thank you all for all your inputs.
By the way, the other thread, where I mentioned I would go for BTRFS, Grub… etc. I shyed away! (a bit old man here (63 y/o, a bit impatient) and well, my rule of thumb to stick to the defaults though I sometimes tend to be naughty and break the rules and always trying something new.