GSkill is the leader in DRAM, innovation, new products, widest product line, etc....and the quality shows, Corsair and most others are scrambling to keep up and semi just following the leads that GSkill sets, i.e. Corsair finally came out with a 32GB set of 2400 just a couple or 3 months ago, GSkill has had multiple good selling sets for well over a year now... As far as your selection, I'd definitely go with the RJ X over Corsair but the best selection would have to be based on what mobo and CPU and if you plan to OC, there are actually multiple line of RJ X that fit different combos and scenarios best