BTTS looks guaranteed here. And the total over too. Mainly simply because of the fact that Arsenal are specialists in screwing up games that are going well 
Did you see their game today? Instead of logically leading 3-0 or 4-0 they made it 2-2. The fact that they were lucky this time and won doesn't change the fact that it happens to them regularly. If Arsenal play to win and not torment their opponent with ball control, it will be a fun game.
The BTTS option you suggested I think is a definitely going to play in the Arsenal vs Paris Saint Germaine game and that's because of the prolificity of the attacking line of both teams. Arsenal have been scoring a lot of goals this season same as Paris Saint Germaine but that's mainly in their respective leagues so it's safe to say that the both teams will surely find the back of the net in both games. That being said, I'm struggling to predict the team that'll win the game but since Arsenal is playing at home, I think they stand a better chance of winning the game. Did you see their game today? Instead of logically leading 3-0 or 4-0 they made it 2-2. The fact that they were lucky this time and won doesn't change the fact that it happens to them regularly. If Arsenal play to win and not torment their opponent with ball control, it will be a fun game.Both Arsenal and PSG have conceded 5 goals in 6 games (in their domestic leagues), which is quite a lot considering they are well above the average of their leagues, so yes, BTTS is likely, attack > defense.
As for the odds, I think it's logical that the second team in the Premier League should be stronger than the first team in Ligue 1, especially in a home game. The bookmakers see it like this:
1.76 - 3.70 - 4.90
If this were a playoff, I would say that the odds of 1.76 are a gift.