Very surprised to see such a difference in price for this all EPL clash. On season long form, H2H this season, current form and Europa League form Arsenal are overpriced. The difference has to be the Hazard factor.
Arsenals last 4 matches in Europe saw them beat Napoli and Valencia home and away, and that in my opinion is better form than Chelsea overcoming E.Frankfurt and Slavia Prague. If anything it shows how serious Arsenal are taking this competition.
Arsenal won the last H2H at The Emirates 2-0 in January and I can see no reason why they wont be very competitive tonight.