An HBR.org Registered account and an HBR Magazine Subscription account offer different levels of access and benefits:

HBR.org Registered Account Access: Allows you to Save, organize, and share content with My Library, your personal workspace, sign up for email newsletters, get 20% off your first order. It also allows you to purchase HBR content.

Registration: Requires you to register your email on HBR.org.

HBR Magazine Subscription Account Access: Depending on the subscription tier, it offers unlimited access to digital articles, including premium content, and additional resources like the Big Idea, Data & Visuals, and selected ebooks. 

You can see the Subscription tiers here.

In summary, subscription accounts provide access to HBR’s extensive resources and content.