Like Mina said: DE is Desktop environment. Mate can be installed on most, virtually al,l that I have tried. It’s one of the things I like to check when I’m playing with a new distro. I’ve stayed away from nvidia for years because of the driver problems-I like amd . Of the two you probably will have fewer “tests” with ubuntu. Debian in general can be a little behind in the hardware area. Ubuntu has prolific help system, also.
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