That odd that was given to Real Madrid vs. Arsenal even at the Emirates is very attractive. I would rather risk it for A Real Madrid win in the champion's league rather than give it to Arsenal. People are most likely to get shocked again tomorrow.
I think it could be worth risking, but IMO, I'm still not sure how the game is going to go. I haven't watched any Arsenal versus Real Madrid game before, but considering both teams' current performance, I would slightly favor Arsenal to win, even though I'm not underestimating Real Madrid, as they are always full of surprises.
The first leg is at the Emirates Stadium, giving Arsenal home advantage, and I feel that after the first leg, we should be able to come up with a more precise prediction. Yet, Real Madrid are also somehow strong in second legs; we've seen many of their comebacks, especially at this current UCL stage. However, they haven't been playing so well at home either, and that's somewhat giving me doubt.