I'm not sure this is the source for the answers you seek, but I don't know where to go to get those answers, either.
I don't know that anybody here can tell you which is best short of their own anecdotes. Unless they've painstakingly gathered all of the reports here and created some data table to analyze, it is just their opinion of one or two products. Even armed with that data, you'd have to know the customer base for that product since people that don't have any problems don't post here. The volume of posts may only be indicative of market share.
Based solely on brand, you can have myriad differences in performance, too. HP, over its lifetime, has made products that only worked in certain environments. With a large array of models, you could have different results all across the brand. So, people that report they have had good success with company X may be of little value because the model they bought did work great, but you can't buy that model anymore. And, whatever great support they had may not exist anymore.
Based on what I can remember of things posted here, Brother seems to get a good review, and I don't see a lot of reports of problems with them. I don't own one, though. Might be my next purchase after my Epson Stylus NX530 dies or they stop making ink. It's been running flawlessly since at least OS X 10.6, and you can still download drivers for it. They do have business-class printers, but they are all inkjet, I believe.
I don't think I have seen many reports on Konica or Sharp, here. But, unless it was a generic printer post, I wouldn't have looked at it as I don't own either of those products. Also, the market for those is likely not as big as the other consumer products, so you're not going to see as many reports about them just based on the user base. I've seen lots of posts on Canon, but I don't know if those skewed towards printer issues or scanner issues--most likely scanners.
I can't imagine any company providing a warranty that covered "accidents." You can probably buy a rider from your insurance company to cover such a thing, but the manufacturer is not going to take that risk.