There teams that are way stronger than Real Sociedad in Spain apart from the big 3, we have Athletic Club, Villarreal and even Real Betis is way stronger than them. That's by the way though. HT right now and as the game is going, Real Sociedad is doing most of the playing and dominating the visitors but it's Manchester United that's making the attempts to try and score. Real Sociedad is not really threatening the Manchester United defence as at first half. Let's see what bot teams will do in the second half of the game.
Athletic Club, Real Betis and Real Sociedad are of the same if by category we should use, sometimes one thing that tries to disequate club from another is the clubs they often meets, let's say Real Betis and Athletic Club has more of those clubs on the relegation for their starting while Real Sociedad has Barcelona and more top others, there results with the other mentioned may deferres in points but doesn't mean they're more than them, so that's how the league is for them. However Real Sociedad later equalize to Manchester United after Zirkzee had their keeper disorient with his goal, their penalty solved the problem.