Even though Mallorca finished in the top 10 last season, I've always considered them to be very weak against a popular team like Barcelona. Mallorca would always lose against Barcelona, and the best result for Mallorca would be a highly unlikely draw. However, I wouldn't underestimate a team like Mallorca this early in the season and would bet on BTTS (Yes) to get more decent odds.
So you're betting for 1.7 instead of 1.4 and hope a team that has scored less than one goal per match last season on average will score against Barcelona?
You get the same odds for an asian handicap of +1.25 by betting on Baca, and here we talk about the team that's scored 2.5 goals on average.
For a 1.7 is really not worth it, you're better of with Barca just chasing those +2 wins, far more rewarding for the odds.