Making a two way bet will be the best for games like this, now that we have opta prediction making PSG the favourite is also pushing the traffic in favour  of PSG meanwhile it is possible  Chelsea may be the winners so I think it will be even safer if you separately pick Chelsea with a considerable fair stake that you can afford to loose and will at same time make good profit if it turns out in your favour and also do same with PSG, that way either ways you can be sure to make some profit and not become disappointed at whatever outcome we see at the end of the match.