Sweden and their “experiment” has been a topic of conversation on this thread for a while.The UK rates are terrible through inaction. They make the US rates look good. But for action and inaction. I would suggest Australia and Sweden. The Swedes didn't do nothing, they just didn't do much. They have a lot higher numbers than their neighbours.
Australia have 19 covid cases per 100,000. The deaths are 0.34 per 100,000
Australia and New Zealand have both seemingly had great success.