Visa Type for South Africans Attending YC

Looking for some advice from fellow South Africans who have travelled to US for YC or any other incubator programmes on which Visa Type to apply for?

We've applied to YC W18, and wanting to sort out travel visa for when/if we get accepted.

US Embassy points towards either: B-1: Temporary Business Visitor Visa , or B-1/B-2: Business & Tourism (Temporary visitor) visa types.

I have searched HN for related answers with no luck.

Thanks