It boils down to preferences imho.

I like text-based stuff in general, so having a launcher that displays my favorites app as text and launches any app as soon as I type the beginning of its name is a real plus for me.

Open-source and de-gafamisation also matter to me, so I want to make sure knowing my launcher doesn't track me - I usually choose one that's available onF-Droid for this reason.

OLauncher has these features and has a smaller footprint than default launchers, sl I swapped.

But afaik there's nothing "wrong" with the AOSP launcher.