Portable apps usually offer the same functionality as the regular versions of your favorite software, but without any installers involved. That means you can run them directly from a USB drive or a cloud folder synced across PCs.
I definitely advocate for Everything, LibreOffice, MusicBee, AIMP, OBS , 7-zip and SumatraPDF. I actually use all of these apps in Portable mode and they do everything I need them to do. No bloat or unnecessary features either. The best of the best, to be honest. Special mention to Tixati as well.
WinSCP really is god sent, used to make websites years ago and this client out of nowhere suddenly wanted some quick fix just days ago, and I remembered about WinSCP I used to work with that I put on Google cloud, damn, that portable WinSCP still works, and fixed my client in no time. Portable apps rule.
Firefox portable (used this for at least 6-7 years (if new Windows or new system, it is always perfect configured, you only setup it once, countless add-ons and changes and it always stays the same)
Same goes for windows install, 80% of what I use is always "installed" they remain in D:\Progs\PortableAPPs partition. off course I have tons of other apps as portable, and some that can't be portable installed (not many)..