I've used about 4 different ones, and my best performance came from the standard Samsung Fast charger. No more shuffling around to get the correct location where charging would start. Just drop it on and away it goes, and through my case as well. I now have 4 of these placed at home and at work. (this link is the refurbished version).

https://www.amazon.com/dp/B06XP8XBJZ/ref=cm_sw_r_other_apa_i_rp36EbK67B88H

There are definitely cheaper ones out there, and probably some that work as well if not better, but I just wasted money with the ones I chose. YMMV