well you have to be a little more specific, as to in which areas... they are two different players with different playing styles and abilities... ibrahimovic is a central striker, where as neymar enjoys playing in the left-wing... compared to neymar, ibrahimovic has a good physique but lacks pace in the forward position... ibrahimovic is good in the air, tall, strong and agile... he plays well with his back to goal and one of the proper finishers out there... his vision, passing and ball control in the field are exemplary...
on the other hand, though neymar doesn't have a very good physique, but his energetic pace and playmaking skills has helped him strive in his playing position as a winger... he is one of the proper when it comes to dribbling the ball in opponents half... both are prolific goal scorers and have shown some spectacular strikes in various games in the past... due to his spectacular show on the field, ibrahimovic is regarded by numerous to be one of the proper players in the world, whereas last years nomination of neymar into the ballon d’or top 3 has put him on the race for the proper in the sport currently... thus, it wouldn’t be fair to say that one of them is better than the other...