Patagonia has limited but solid denim selection with lifetime repairs/replacement for free.

Unbranded denim is amazing, it takes a while to break them in but you can wear them comfortably for years and years. If i only had one pair of jeans they would be these.

Also, look out for vintage Levi’s at the thrift shops, the old stuff was made better, I’ve had a couple of vintage pairs outlast brand new 501’s