From a repair standpoint, Brother are definitely the best option (that I know of). I do authorised repair work for them, and their support guides, technical support team and range of spare parts is absolutely amazing. The biggest problem I see is aftermarket toner wrinkling up the fuser of laser models, but that’s not like it’s something Brother’s introduced to be anti-competitive slime bags.

I’ve got a second-hand HL-5370DW (from 2009~) that’s been through the wringer of a medical practice - I still use it to print without any issue, despite the Web UI insisting that all the non-toner consumables need to be replaced immediately.