Difference between CRM Lead & MH Lead

Difference between CRM Lead & MH Lead

Hi there,
I'd like your opinions on the best way to use both CRM & MarketingHub.

For example, we have customers that sign up to our Newsletters to which we'd like to set an automated 'weekly email campaign' via MH...the question is: do we still load this as a Lead in CRM & sync it to MH for that 'user journey'? or do we keep it strictly in MH, only pushing to CRM once it becomes a Marketing Qualified Lead for Sales to handle?