Two different companies, two different management team, design team.
Logitech, best, good quality, sells world wide, and what not, Cheaper, wont break easily (If you don't rage quit)
Razer, best, good quality, doesn't sell world wide, not cheap, wont break easily (If you don't rage quit), has coolness in them.
Two different things, and you compare them, they're both good on they're best abilities..
But at my opinion, Logitech, I put my hands down for them.