Penny Tracker

I am contributing to 401k and maxing it out as part of my employer’s retirement plan. The money in the 401k is getting invested in Mutual funds. I also plan to open a Roth IRA and would like to put $5000 (max amount). I have 30 more years to retire. At this point, is it advisable for me to invest the amount in the Roth IRA in mutual funds or in stocks ?