If you want a fairer view without bias, try looking at the last five seasons, including last season. You'll certainly find a more balanced picture. In the last five seasons, Real Madrid has won La Liga twice, and Barcelona has also won twice. The other victory was won by Atletico Madrid, so this provides a clear reflection that Barcelona and Real Madrid have indeed been the teams that have dominated La Liga the most. However, I don't know which team will win this season because Real Madrid is still far from perfect under their new coach.
I would put Barcelona first to win this season. One of the simple reasons for this is that Barcelona has a balanced team and their coach is also very skilled, especially in big matches we see great planning and strategies from Hansi Flick to defeat the opposition. My second choice would be Real Madrid, I don't think it's unfair to put Real Madrid second. They have just changed their coach and Xabi Alonso is not used to Real Madrid yet, he is not even proven with big teams. So for now I can't put Real Madrid first in the list of favorites to win this season. On the other hand, Atletico Madrid's team is not in a good shape at all, I don't think they are a strong enough team to fight for the La Liga title at the moment.
Looking at Xabi Alonso's managerial career, one would not say he's doing badly especially when he was at Leverkusen, he was able to reform the team and bring them out of shambles to the successes they recorded using his 3-4-3 formation which was unique and popular for its counterattack abilities. He understands how to take advantage of a dysfunctional defense and midfield especially that which not firm and tactical, he will always find a way to send his players to attack the loopholes. He's never managed a big team like Real Madrid before, so I know his first el-classico will take much of his time and efforts in planning because despite being the head coach, he has the dignity of his team to protect. He's gathered enough experience when managing for the Leverkusen so I expect him to use much of such experiences on his games, going further. This season is really going to be interesting to see Madrid drag the season's title with Barcelona but even a seasoned coach like Ancelotti couldn't do better last season so it is more of an honorable challenge for Xabi Alonso to show his skills and steer the ship to their dream land.