Cobb seems to be making progress on the 2010 GTR LC considering the new thread that they made. I like that with the cobb you don't need a laptop which makes uninstalling/reinstalling easy. I guess it just comes down to preference. I like that cobb has a presence here on the forums which is a plus. I think Ecutek is just represented by vendors if I'm not mistaken. Also not sure if Ecutek supports e-tunes or not.