I think Danny Welbeck is more of a hardworking lad than Balotelli, but Mario on the other hand is more experienced. If Chelsea had no other choice than this 2 strikers, I would pick Balotelli. These stats don't help much to determine who is better it's only 5/6 appearances and each one play in a different style club. I think Balotelli would do exactly the same if he were under Wenger since the players will play around him. We will see at the end of the season though.
The stats back it up. Danny Welbeck has been a better striker than Balotelli in almost all departments this season. But who would you rather have as a player?