#3 The outcome was harder to predict
Ronda Rousey and Nikki Bella did the best with what they were given. However, it was clear to see that Rousey's dominant streak would not be broken by Nikki Bella. Anyone who's watched WWE for any length of time could predict that. Therefore, we all knew how the match was going to play out.
We did not know how how Flair vs. Lynch would have played out. Both women are fantastic competitors who've put the women's division on the map. The title could have gone to either woman and not affected the overall narrative, right now.
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Therefore, the crowd was far more invested in the SmackDown Women's Title match, I felt. They were not disinterested in the RAW Women's Championship match, but they didn't care nearly as much.
Any story is more interesting when you don't know how it's going to end, right?