Bernard loses the ball more often, has fewer shots per game and fewer successful crosses per game than Barnes.
He has 2 goals and 3 assists in 36 appearances in all competitions. At 26. Barnes has 10 goals and 8 assists in 45 appearances in all competitions. At 21. He was called back to Leicester after being one of the best players in the Championship and continued that form in the Prem in the 2nd half of the season.
Personal preference, I'd rather take a chance on a kid who I think will play for England, as opposed to Bernard who's ceiling (in my opinion) isn't too far from where he is now.