Power Conditioner, which of these 4 and why?

I don’t know about the others. But if those you listed I have the Shunyata MPC. There is some filtering going on with them. I think there build quality is terrific. You may want to add a Shunyata Defender. But a better solution in my opinion is to get a PS Audio PowerPlant. That unit will complete regenerate your power into a clean sine wave like no Power Conditioner can do. That is how I have gone. I use my Shunyata MPC and PS8s in my two systems as extra outlets and power distributors for my PowerPlants. Wall outlets are Shunyata too. I also bought on Amazon some Green Wave dirty electricity filters. With all that I have been very pleased. But the core of the power handling is the PS Audio PowerPlant.