Real Madrid is currently doing so well in the la Liga and I don't see Real betis as a team that will in anyway match Real Madrid, the draw was more like a fluke, because Madrid didn't play so well in that game and it was obvious that wasn't their normal form so betis could be considered lucky with that game and not to consider they were able to get a draw against Madrid.
Im subsequent meetings I'm sure Madrid will get a flawless victory over Betis, especially if it turns out Real Madrid is at home, Real betis will definitely struggle to get a goal against Madrid in their presents form. Real betis tho in their current form are also good, I'm their Last five matches, they have lost none and won three which could imply that they are currently a lot above average, hence they will definitely be tough on Madrid if they meet again in their current form.
In terms of strength, Real Madrid is far superior, but Real Betis should not be underestimated because their performance in the last few matches has been quite good and consistent and Real Betis has not even lost in their last 5 matches, so in my opinion they can be a threat to Real Madrid in this weekend's game.
Real Madrid's performance is currently at the top of its game even though several of its main players are suffering from injuries, but so far this has not affected the team's performance, but I see that there is an empty gap in the Real Madrid team, namely consistency which they are often unable to maintain.
So nothing is easy to predict.