I'd say support, whether it be official or unofficial.

Try googling any printer you're looking at + any random common error (not sticking to bed, not heating up, slicer options, etc...) and see what kind of results pop up and if they look helpful.

One of my printers is one that has ZERO support from the community and what you can get from the manufacturer is limited and it kind of sucks when I have problems with it.

Enders for all their faults at least have an insane community support (note: in 2024 I would never recommend an Ender 3/5 as a first printer).

My most reliable printer is a Qidi Smart-3 ... vendor support has been great and the Facebook groups for it have been good too. The downsides: z-offset is manual & it's 185x185 which is pretty tiny and it's a bit of a pain to change the filament.
Upsides: core xy, fast, reliable, klipper
From what I've seen though, quality control is hit or miss, but the manufacturer seems to take care of you, so YMMV, mine hasn't had problems that weren't self induced.