I bought a gaming router years ago, never had a problem with wireless until just recently. I noticed more of my neighbors getting wifi and the fact that my router is becoming outdated (signal interference and degradation), I decided to switch to wired however I didn't want to move my PC since I have it set up nicely in a room on the opposite side of my house. So I caved in an bought a powerline adapter kit, and I couldn't be happier. Now I run my router to one adapter through an outlet, and my computer/game consoles to a switch which is connected to the other adapter through an outlet in my gaming room.

In short, wireless is good if your signal is good and nothing interferes with it. Otherwise wired is best.