I would consider Barcelona to be the best team in La Liga so far. Because Barcelona have been performing brilliantly since the beginning of this season. Besides, two new incredibly good players have been added to the team a few days ago, so we hope that the team will be stronger.
Have you been watching a different league or club or are you sure that you are talking about Barcelona from La Liga? If you said that they played ok so far, I would think ok, it is your opinion. But you consider them to be the best team in the league when on average they concede one goal per game, already had a draw and sometimes have massive problems with their offense. They lack some high quality experienced players and not a lot of people think that they will make it very far in the Champions League. They are behind Real Madrid and there are three teams who have a better goal difference, but in your opinion they are "brilliant and the best".
However, both of them are still the best in La Liga, when the two meet in the "El Clasico" match, it will give a full picture of who is the best this season.
I wouldn't pull the statistics card only here and make my judgment based on who has more points right now, but I think that assuming that Vinicius Junior will return in maybe 12 weeks and everyone else is healthy, Real Madrid is the slightly better team in my opinion. I don't know whether Lewandowski can still be considered this one-man-show player he used to be when he was in his best shape possible. That was impressive, but he already played a little bit under his maximum last season. He scored goals and he did so on a regular basis, but I remember how he played when he became the best player in the world. That was a different level.