The bookies are also not favoring PSG... because playing in the Emirate it will be the Gunners. 
Strangely enough Arsenal when going to the top they are inconsistent, but we never know if in this semi-final maybe they will not miss losing... we have seen the proof of slaughtering Real Madrid which is quite large.
Do you support Arsenal? Same here.
Arsenal should indeed be favored because they are playing at home but remember that this is a semifinal match and PSG is an opponent that should not be underestimated, throughout the journey in UCL this season PSG has eliminated 2 teams from the Premier League which of course has increased the mentality and confidence of PSG players because of that.Strangely enough Arsenal when going to the top they are inconsistent, but we never know if in this semi-final maybe they will not miss losing... we have seen the proof of slaughtering Real Madrid which is quite large.
Do you support Arsenal? Same here.
I think for the first leg of the semifinal between Arsenal vs PSG no one is favored too much and everything is possible to happen and that is not a surprise, I myself still think this is a fierce match and it is likely that both teams will draw and that will certainly make the second leg much more interesting.