The Bambu Lab printers were something of a revelation when they first appeared, due to their their price, their out-of-the-box usability, their availability and simplicity. At the time there was little to compete as a package. Other manufacturers have caught up somewhat, especially regarding speed, and some concerns have cropped up around the Bambu Labs printers - chiefly their need for prints to go via a Bambu Labs server unless printing from an SD card, their automatic firmware updates (even one case where prints would attempt to restart overnight despite a finished print being on the build plate), and some hardware faults. Like most 'brand wars' discussions though, I suspect these issues haven't bothered/affected the vast majority of users, and the Bambu Labs packages are still undeniably good quality and value for money.
I have a couple of Prusa printers - one MK4 with the MMU (for printing with more than one filament colour/type, like the Bambu Labs AMS), and one MK4 that I've upgraded from an earlier MK3S+. In both cases I bought them as self assembly kits, and spent approximately a day on each one building it up - very satisfying and a great way to get to know the printer for the inevitable occasions when some disassembly is required to recover from a failed print and/or to repair/upgrade parts. The Prusas are more suited to DIY than the Bambu Labs, if that's your thing, and they make a point of providing an upgrade path whenever a new model comes out. For instance, I've recently placed an order for an upgrade kit to take one of my MK4 printers up to the latest MK4S spec, which can print even faster than the MK4.
In 3D printing, the first layer is the most crucial thing about getting a good print. A number of factors affect first layer success, but the chief one is the gap between the tip of the nozzle and the build plate - even tiny variations across the plate can be critical. The Bambu Lab uses LIDAR to measure this distance in a grid across the build plate, and the Prusas use a load sensor - both can achieve a perfect first layer, and have helped new users to get going without endless adjustments.
There are other brands out there - with similar speed capabilities (speed itself may or may not be an issue for you, but generally a faster print allows a thinner layer height, e.g. 0.2mm versus 0.3mm, which improves print quality) - some are targeted at the DIY crowd for instance, and require you to source all the parts yourself. Whichever one you go for I'd certainly recommend getting one with a removable spring steel build plate and some way of getting a reliable first layer that doesn't involve twiddling adjustment screws! And make sure it has a heated print bed, since PETG and ABS/ASA require this. In fact, ABS and ASA in particular require a high ambient temperature - the Bambu Labs has an integral chamber which is passively heated by the heat bed, whereas the Prusa is an open frame that requires a separate enclosure to achieve the same.
Consider whether you really need the ability to print with multiple colours - I have a Prusa MMU on one of my printers, but rarely use more than one colour. In common with the Bambu Lab AMS, it tends to add a lot of extra time to a print, and can be very wasteful of filament since it needs to purge the old colour from the nozzle before the new colour runs clear.
