Zoho One - Zoho MarketingHub - Zoho Campaigns

Zoho One - Zoho MarketingHub - Zoho Campaigns

Being a Zoho One customer i'm trying to decide how to best use each of these Zoho apps, Campaigns and MarketingHub.  Curious to know others approaches.  Maybe use MarketingHub for Lead management and engacement, and Campaigns to email current customers with newsletters and such?  Thanks to all for your feedback!