While not the best written article in this regard, my impression is the comparison is about the impact each is having on their respective parties. I'm sure we agree that Zuma's theft of the SA fiscus is far worse than Zille's stupid tweets. However, the fact is that people are looking at how Maimane's deals with her disciplinary hearing as a way of gauging whether the DA is actually a creditable opposition, or if, as the EFF likes to say, he is simply fronting for the madam. 

We've seen how the ANC has dealt with its motion of no confidence in Zuma, so hopefully the DA can take a more effective stand on their issue and come out if it looking like an effective political party, rather than like a bunch of gangsters trying to stuff their pockets as much as possible before their house of cards collapses!!