Roth-401(k)

My company just added a Roth 401(k) investment option to our retirement plan. I am currently saving 6 percent of my salary in my 401(k), with a 3 percent match from my company. (This is the maximum match.) Now that there is an option to invest in the Roth, with the same match available, I am not sure how to adjust my investments. I don't have any other retirement savings besides my 401(k). I have talked this over with a few of my friends and none of them seems to know the answer, either. Thanks for your help! Priscilla, Greenville, N.C.