I also think about Sociedad recent performance, they haven't been very consistent in collect points, even they lost against Valencia. You're right Cadiz sometimes make a surprises, but the head to head record seems to be an important point for me if want to bet on this match. Sociedad have a high chance of getting three points tonight, so I'll bet on Sociedad to Win, wish me luck. 
although Cadiz could surprise Sociedad. I also place a bet on Sociedad. the odds of winning are better than Cadiz or the best chance of Cadiz is a draw.since I also bet for Sociedad, good luck with our bets. because all that can make Cadiz win is their luck. they are not without odds but statistically, Sociedad is still the best for this bet.