I will personally go with Betis as usually teams from Sevilla have in their DNA to win European championships and Betis is looking for decades to lift a trophy where Fiorentina had their chances 2 years in a row right ? and they lost both of them.
Chelsea vs Djugarden should be a walk in the park for Chelsea but I could see Djugarden scoring against them at least 1 goal.

Betis played quite nicely and made use of home advantage by a 2-1 win. Since Antony joined this team have turned into something else.

It is like he has done some magic on the players. I also see Betis as the closest team that could defeat Chelsea in the finale.
As for Sevilla they must be really missing their good old days. They are far from achieving a European championship for 2 years. Lastly it is a really accurate prediction about the Chelsea match. Did you bet on a score? You might have won a really good amount.