Wikipedia's assessment is more accurate. Wikipedia does go on in its second paragraph to explain the context of the start of the campaign, including "The Zoe Post" and the accusations of conflict of interest. But the broader impact of Gamergate was as a misogynistic online harassment campaign, and Wikipedia is correct to make that the central part of its summary. Just because Grokipedia is more reluctant to state a conclusion does not make it less biased.