The difference is the reliability of the infrastructure. The single-node may become unavailable at times. it is also less powerful.

Single Node

  • Your project is only composed of one machine that can become unavailable when automatic updates are performed
  • You have less computing power 
  • You can try the Squarescale service at a lower pricey

High Availability 

  • Your project is composed of 3 or more machines. When one machine is updates, the other machines are still up to continue serving your services. Single instance services are migrated to keep running.
  • You have the higher computing power for your production application
  • You get the benefit on a fully reliable infrastructure by Squarescale 
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