There's a fairly obvious way to see that the Apple one is higher quality than the Samsung one, if you happen to own both, like I do. Plug them both in and be q

There's a fairly obvious way to see that the Apple one is higher quality than the Samsung one, if you happen to own both, like I do. Plug them both in and be quiet. You can hear the Samsung one making a high pitched ring, while the Apple one is silent. This is probably due to the superior diode bridge snubbers in the Apple design (if, indeed, they exist at all.) Having a high-speed diode connected directly to a transformer is an almost guaranteed way to setup an oscillation, which can lead to audible sound, and always leads to electromagnetic interference. And the sound is really annoying.