DSL. I have never had a major problem with my current g Linksys. Albeit my current ISP speed is only 5-6MB or so when not overloaded from usage by other homes in the area so HD quality is limited to be sure. Only occasional issues depending on the video. However its the wireless streaming from my computer with high quality videos that cant keep up that is most obvious. Currently using Kodi on my firetv. A nice thing to install if you dont have it. Unfortunately wired isnt an option.
Currently as long as bitrate doesnt go over 6-7mbps, depending on buffer, it can usually keep up. Some videos I have seen go up to 20 on some complex shots. I have one movie, made in 1984 released with little DNR to preserve the original look, that on test mkv runs still have pretty high bit rates due to the grain. I dont particularly want to run it through my own DNR. Anyways, after reading more I stayed away from TP-link. Too unreliable in the long term and customer support from China is terrible. If at all. But all the major brands looked good and I chose this one.