(I assume you mean the 681 here, don't know why the 661 would be interesting when it comes to gaming).
Thanks, you're right, The Superlux 681 and Samson SR850 is basically the same headphone. Sorry for mixing the 681s and 668Bs up. So basically he should buy a Superlux 681 since it's cheaper and the same thing as the somewhat more expensive SR850. Correct me if that conclusion would be wrong.
Samson SR850 and Superlux 668B are basically the same, the difference is: The impedance, detachable cable, and headband, but the sound is too similar.
The 681 is the little brother of both, I think so...