The reality is in the middle of these two:

You can be unlucky and still successful (e.g. Oprah Winfrey was raised in a poor, traumatising, unstable household but still became wildly successful)

But hard work can’t undo luck in all cases (e.g. if Warren Buffett was born black or a woman or in war-torn Iraq, no matter how much he worked, he wouldn’t have the same opportunities/success he did)