Thank you for a very helpful breakdown.
One potential caution to other readers: I tried to purchase the Choetech Dual Wireless Charger recommended here. The recommendation is good on the merits, but the company itself is a little sketchy. They confirmed my order and charged me for the product, but never sent it. They were completely unresponsive to all support requests over a period of several weeks. I tried to cancel the order, to no avail. I eventually had to file a dispute with my credit card company. So if you are looking for a wireless charger, you may be better off steering toward a more responsive company.