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>Why should I buy the „Trezor One“ over the „Trezor Model T Express“, and vice versa?
T supports more coins. T has a keyboard (and therefore more secure as you don’t have to enter the passphrase into a computer).
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>Will the „Trezor One“, and the „Trezor Model T Express“ connect+work without issues on Ubuntu 20.04, and Linux Mint 20.2?
Linux is officially supported for both models
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>Does the „Trezor Suite“ desktop app work without issues on Ubuntu 20.04, and Linux Mint 20.2?
Linux is officially supported for Suite
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>Why would I need to run the „Trezor Suite“ desktop app over the „Trezor Suite“ web app, and vice versa?
These work and look identical. Some devices cannot use the app but can use the web. Web doesn’t have to be installed, and is always up to date (unlike desktop which has to be installed and then manually updated). Just a personal preference either way for the most part.