I have three similar Qi chargers for my Galaxy S6Edge phone. One is the OEM Galaxy charger, the other two are less expensive after market units similar to your links.
I see no difference in my three one to another. They are slower then the direct wired plug.
also, all three suffer from the same "problem!" That is, when you set the phone down on the charger the only way to tell if they have paired up is to look at a small light on the stand. The problem s, the light is on the edge of the stand and is entirely covered by the larger phone.
I cannot count the number of times I've put the phone on the stand to charge only to return and find the phone has less charge then it started with.
I get it. My bad! Note that I have not gone back to the wire and plug method. lol