Fedora does the same thing where you can choose between RPM or Flatpak. The only flatpak package I’ve ever had problems with was OnlyOffice, and the issue was that the scaling was blown way out of proportions. Switching to the RPM version resolved that.
You literally can’t go wrong with a Brother b&w laser printer.
Check out Minifree Ltd. They refurbish old Thinkpads, replace the bootloader with libreboot, and come with encrypted Debian KDE. They offer either the T440p or the X230, and you can choose different SSD and RAM configurations. Prices are as low as £258.00 for the X230 with 16GB of RAM and a 480 GB SSD.
Take a look at Minifree Ltd. For less than USD $500, you can get a decent ThinkPad with Libreboot and your choice of Linux distro (KDE Debian is installed by default).