If you ask me which club that potentially win the game. The answer is obvious it's PSG. Even majority of voters are favoring PSG to win the game than Chelsea. However, i absolutely agree picking 1x2 straight win club is very difficult, but also disagree to pick the score line and prefer to pick BTTS for this game (consider it offers lower risk).
I don't think they can beat Chelsea with clean sheet in this game, and prefer to pick BTTS. I believe both clubs will be going all in this game. I also have Asian handicap as my alternate bet (PSG -1.5) ,which also sounds better instead of picking score line with 90% chance to lost.
Your preferred likely selection is nice that shows that you are very strategic and careful while making your bet selection, for me ov1.5 will be good selection for me considering the fact that there may likely two goals coming from that match, straight win in this match is risky despite who's better among the two clubs, let's not forget that, it is a final match we are talking about and as such we can't actually say the outcome despite people believe that PSG will likely win the match, I agree with you said about picking score line, I think that's not a perfect decision for anyone to make in a match involving teams like that in the finals, no no, it is better for one initiate safety measures despite being aware that no bet is sure but to an extent we can go for lesser risk selection.