Thierry Henry is the best player in history of Arsenal. French international has 175 goals and 74 assists recorded during his career.
Here is top-5 of Arsenal (goal+assist system) in history.
Dennis Bergkamp-87 goal+94 assists
Robin Van Persie-96 goals+39 assists
Ian Wright-104 goals+19 assists
Theo Walcott-65 goals+43 assists