If you are a casual user (want to play some popular games in GNU/Linux) then you can probably pick PopOS. It is based on Ubuntu but have been integrated with Nvidia drivers out of the box (don't need to do hassle setup). If you are not familiar to setup drivers for your GPU then PopOS really helps with that.

If you have just migrated from Windows and still learning about Linux environment then Kubuntu is quite good for transition.

If you want challenge, have lots of time to tweak or even debug some unexpected error then Arch linux is your friend 😄