Neymar scored four goals, one of which was a pen.
Robben scored three goals and assisted once.
I'd say it's about even.
I'd give the notch to Neymar cause he is basically doing everything on his own and Robben tends to disappear for large chunks of the game, it's pretty close tho.
For the record i have always considered Neymar one of the most overrated players in recent years but out of all the stars expected to shine in the tournament he has been by far the best.