Is gaming the only thing you'll use it for? If it's a general use TV, and you watch movies, I'd do the OLED. If it is strictly gaming, I'd flip a coin. Both have pros and cons.
Honestly, I won't buy TVs anymore that don't have reviews on Rtings.com. There you can find technical, but understandable reviews that cover every use case that the average person will run into. There's just no good way to get real-world comparisons. So, before you settle on either of these, I'd look there and see what they have to say.