Paris Saint-Germain have the opportunity to achieve something only one team has managed in the Champions League era by retaining the trophy and winning back-to-back titles.Luis Enrique’s side swept all before them to become European champions for the first time last season and are threatening to do so again, with Arsenal the only obstacle standing between PSG and a second successive Champions League crown.Arsenal will put up a fight. The newly-crowned Premier League champions have kept more clean sheets (nine) than any other team in this season’s Champions League and their defence is currently the best in Europe.At 4/6, though, PSG are firm favourites to get their hands on the Champions League trophy again, and with good reason. The French giants will take some toppling and are 6/5 to win the game in 90 minutes.By several metrics, PSG have the advantage over Arsenal heading into Saturday’s encounter in Budapest. This is certainly true when looking at the average possession share between the two sides. While Arsenal are ranked 11th in this season’s Champions League, PSG are second, only marginally behind Bayern Munich.PSG are averaging 547.6 accurate passes per match in the Champions League compared to 389.4 per match for Arsenal. It seems unavoidable that the reigning European champions will control the majority of possession on Saturday.This is not possession without a purpose, though. Indeed, PSG are exceptional at translating their dominance of the ball into attacking opportunities, as illustrated by the fact only Bayern have registered more Champions League ‘Big Chances’ so far this season.