title: Magento 2 EE multi-website vs multi-store
body: <p>I initially set my system up as multi-store on a single website and I'm running into some problems.  Right now I've found I'm having trouble restricting users from specific stores.  I'd also like to have specific payment methods and shipping methods only available to some stores.</p>
  
  <p>I think the last two problems will be solved by making this a multi-website (I will attempt to use the same domain and a different folder structure for each website).</p>
  
  <p>Once its a multi-website set up, is there a good way to only require a user to register once (for all sites), but only allow them access to specific stores set by an admin?</p>