Why might I ask?
The current all out war emphasizes all that is bad about both.
The stupidity of the DA anti-Zuma campaign shows an opposition unable to campaign on policy - but instead is anti-everything. I once suggested this to Tony Leon after another anti-ANC crime diatribe. He looked genuinely hurt. "I thought my speech was quite positive..."
Further, it is actually an indictment on the DA that they are 15 years into democracy and still predominantly white and male. Joe Seramane is used as quota chairman despite his very real struggle credentials. I'm white and male and I don't relate to the DA leadership. My workplaces and social life are more integrated.
On the other hand, the ANC and communist responses have been nothing short of staggering. Particularly the responses of their youth leagues. Grief. I wrote more mature letters at 6 years old.
Frankly, the responses are transparent. The ANC has merely been paying lip service to democracy. Threatening to make the Western Cape ungovernable betrays their inability to countenance opposition and debate. Further, their insistence that Zuma must not be criticized because he is president is immature and dangerous in the extreme. You earn trust - no matter who you are. Further, the essence of democracy is the ability to criticize freely. Would the ANC have insisted that Americans refrain from criticizing George W. Bush?
All that said, whether quoted out of context or not, Zille's reference to Zuma's aids risk to his wives was ill-considered and frankly, naive.