Ventoy is also my choice. You can just add .iso files on your usb disk and they are all bootable. Super easy

Honestly, your question will get a ton of different answers because it’s so open to people’s preferences. It’s like asking “I want to start using a car, which one should I buy?” There will be so many different answers that it’s practically useless, from people recommending a toyota aygo since it’s cheap, easy and reliable to people recommending a Abrams tank “because it can handle everything”.

imo, try Linux Mint or Ubuntu since they are accessable and bring most software out of the box. But it’s up to you, you cannot really lose when picking a distro.