Prusa is king. High quality. Open source. EU made and engineered. Slicer is a market leader (Bambu's a fork of it).
(And I stayed once I saw the quality. Likely Prusa can match or exceed it, but not with what I was willing to lose from my wallet.)
I bought the Core One kit to understand better how the machine works, which reduced the price delta somewhat.
It remains to be seen over the long term which way is actually better financially, as Prusas have historically had long lives, while there is only limited data on the Bambu Lab side yet.
So far, I am quite happy with my decision. But competition is on. I am excited about the upcoming INDX system for the Core One: if it delivers on its promise, it will be fantastic!