I think the most recent was Samsung. Honestly, I've changed brands so many times that I can't remember for sure, and have found problems with all of them. I think our current model is a GE, but even there, I'd have to walk over to the kitchen to confirm.
I'm always in a big rush to find one that fits the opening, when one dies. So I am usually grabbing whatever I can get quickest, over shopping for a particular brand or model. We like to have over/under configuration, in a cabinet opening more popular for side-by-side models, so our selection is usually a bit limited.
One regret is that 2 or 3 refrigerators ago, I trashed a fridge over what was probably a very minor and simple repair, just because I was tired of dealing with another minor annoyance on that model. The required repair was very likely a blower fan motor that cooled the condensor, but the reason I tossed the thing was that the freezer drain would clog about once per year, causing me to have to empty and defrost the whole freezer, spending a few hours to clear that damn drain each time. I suspect that if I just replaced the $40 blower fan and kept cleaning that drain every year, that refrigerator might still be running today.