Betting single on a very balanced game is indeed a fair choice for having a freebet worth half of the bet amount. Anyone that wants to bet on Europa league should avail this promotion because this is great deal because its a extra bucks for a fair bet.
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This is just a freebet with only 10$ value which the original free bet won’t be included on payout. It’s just a waste to bet it on the minimum required odds while you have nothing to lose on it. Bet it straight on Man City.

At least for me it is a bet that makes the most sense.
In this final match I don't have a good enough analysis to choose a winner, Fiorentina or West Ham have equal chances, so I think the most viable bet would be an Under 2.75, since it is a championship final, and even though both teams have a good attack, they don't usually score many goals against strong opponents.
About the bet on Man City using Freebet, if both bets work out, and considering a bet of $20, it would look like this
20 x 1.54 = 30,80
freebet of 10 x 1.49 = 4.90 profit
Total bet: 20
Possible profit: 15,70
It might be more interesting to risk more on the freebet I agree with you, but I still consider it a good choice in my case haha, don't consider it as a betting tip and the values are just for example using the minimum possible amount.