Roth is taxed before contribution, so no tax upon withdrawal in retirement. Many companies will match, so if you pay $2k you get another free $2k from the employer match. 

It comes down to your personal preference and if you have a match. Personally I would never consider it unless I had a match. Even then you're going back into the corrupt and manipulated world of theirs. I say fuck em, I have no interest in playing their games