AWS EC2 Dedicated host vs dedicated instance

Dedicated hosts and dedicated instances are compared in the documentation: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/dedicated-instance.html

Savings plans are a way of reducing your bill as compared to on-demand pricing: https://aws.amazon.com/savingsplans/

I know these are broad answers but the questions are equally broad. Are there specific questions about each item that you have?