GPU Mining is drastically faster and more efficient than CPU mining. The GPU, or graphics processing unit, is a part of the video rendering system of a computer.
Today, gaming GPU's, can have very good hashrates. So if you have a good GPU, you will want to mine with it. Remeber, the more hashrate you have, the faster you mine the coin!
At the moment i'm writing this article, the best GPU's for mining (price/profit) are:
Nvidia GeForce GTX 1070
AMD Radeon RX 580
AMD RX 480
AMD Radeon RX Vega 56
Nvidia GTX 1080 Ti
But you know how technology is right? It's always changing, so tomorrow this might not be true anymore ;)
Like said in CPU mining tab, the most completed website i found so far is MINERGATE
You have tutorials there how to choose the most profitable coin and how to setup your GPU to mine.
At this moment i'm not mining with GPU, but i will improve this section if i find some good news!