[markosaric]

Ubuntu is based on Debian so things such as the way to install applications and the variety of applications available are very similar especially when compared to Fedora, Arch and others which use different package managers.

Main difference you might notice on Debian 10.4 vs Ubuntu 20.04 is that the default Gnome on Debian is a couple of versions behind. Debian only updates security patches rather than new releases between main Debian version releases (10.4 is more like a security update rather than a major new release). You would have to run Debian Testing or Debian Unstable/Sid in order to get the same Gnome version (3.36) as on Ubuntu 20.04.

Other than that there are no Snaps enabled/installed by default (you can install/enable them yourself if you choose to do so) and Debian Gnome is the way the Gnome developers intended it without any extra extensions and customization done (Ubuntu comes with several extensions and other customization enabled by default). You can install these manually yourself if you choose to do so.

Do remember to pick the non-free (as in it includes non-free firmware) ISO from Debian's website as chances are your WiFi won't work if you go with the official free software only ISO.

If you go with the NetInst ISO you can install minimal Gnome which comes without any additional software (untick everything on the last step, log in when the install is finished and then install gnome-core using apt install gnome-core).