Using Lightsail

Pros:-

• The cost is combined with outbound data transfer and is cheaper than ec2 setup
• less overhead at database management, backup policies management
• The Load Balancer included but up to five instances

Limitation:-

• A limited number of instances or you can say, computer family

Best Fit For:-

• Websites built on common applications like WordPress, Joomla, Drupal, Magento
• Websites built on popular development stacks like LAMP, LEMP, MEAN, Node.Js
• Websites that are unlikely to scale beyond 5 servers
• Customers who want to manage their own web server and resources
• Customers who want one console to manage their web server, DNS, and networking

Using Amplify

Best Fit For:-

Single-page Website that utilizes the services in the background or Server-less Applications

• Websites built with Single pages app frameworks such as React JS, Vue JS, Angular JS, and Nuxt.
• Websites built with static site generators such as Gatsby JS, React-static, Jekyll, and Hugo.
• Progressive web apps or PWAs
• Websites that do not contain server-side scriptings, like PHP or ASP.NET 
• Websites that have serverless backends.

Using S3

For static website [html+css+js] without need of a processing engine

Pros :-

• Highly scalable
• Durable
• High availability
• No worry about storage, backup, load, or managing infrastructure

Limitation:-

• Only Static content without the need of a processing engine [html+css+javascript]
• Apply HTTPS

Use Case:-

• Websites that do not contain server-side scriptings, like PHP or ASP.NET 
• Websites that change infrequently with few authors
• Websites need to scale for occasional intervals of high traffic
• Customers who do not want to manage infrastructure