I'd avoid betting on Arsenal or Monaco or any other team that is sure to be qualificated by being first of its group and that is not playing at home.
Yes that's riskier to bet on Bayer 04 Leverkusen v AS Monaco but for Arsenal inform you better because they are equally with PSG.
Don't get me wrong. Paris beat Arsenal to the particular goal-average. The only possibility now for Arsenal to take the lead is to except a draw or a defeat against Ludogorets, highly unprobable.