Looking at the odds by bookmakers, seems that this match will be balanced as the odds show that none of both become favorite.
Spain with about 2.7x and Germany with about 2.8x, so it is hard to bet on which team to win the match if we are relying on the odds.
By statistic during this tournament is also a bit similar because both teams are unbeatable so far but Germany with 1 draw while Spain with perfect wins.
Both team to score seems to be the most attractive market to bet because it is about 1.75 so I think it is better choice than to bet on 1x2 market.
In my opinion, BTTS is too risky since one of the teams (this is enough to lose the bet) may turn out to be good/lucky in defense. 1.75 does not compensate for the risk that one of the two teams will not score a goal. By the way, the first half has already ended and the score is still 0-0, I think towards the end of the game the teams will be less and less inclined to take risks, so the probability of a draw is growing very quickly, now this outcome is rated as the most likely.
That is actually the mistake that many people make, when they see Star matches like this one they will believe that there is no how both teams will not score. With that perceptive they will not play both teams to score and in the end the match might end goaless. We know that both teams to score is possible in the match but it is too risky considering that we are already in the quarter finals of the tournament were goals seems to be scarce. Now that the first half has ended, I doubt that both teams to score result will happen. Assuming one team scored in the first half, it would have compelled the other team to reply the goal. But now that none of them has scored and it is already second half they will therefore be mindful of their own goal posts in other not to concede a goal.
The best bet to place in this match would have been any of the teams to win or draw or even half time, no matter how risky it seems to be is a good bet in this match.