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The Bambu printers are quite locked down. So you are only getting the functionality they want you to have. So the Core One, (Marlin) or Qidi, (Mainsail and klipper), might be your best choice. Crealty seems to be improving with their new models. But their past history makes me very leery yet. I lean to Prusa because I’ve owned one for 5 years now and they still support it. Customer support is valuable to me and worth the extra cost in the purchase price.
I switched my trusty old Mk3s+ over to klipper a few weeks ago. It was even easy enough to add an accelerometer for input shaping too. While still not as fast as the Bambu mini sitting next to it, I have increased the printing speed to 70mm/s to 90mm/s for quality prints. And I can achieve a bit over 100mm/s print speeds with a small drop in quality.
It will give the old girl more years of useful life.