When comparing Koa vs Adonisjs, the Slant community recommends Adonisjs for most people. In the question“What are the best node.js web frameworks?” Adonisjs is ranked 2nd while Koa is ranked 5th. The most important reason people chose Adonisjs is:
If you are already programming in PHP with Laravel, you will have no trouble starting development with Node using Adonis.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Generator support from ground up
Using generators (a bleeding edge feature, even for Node.js) would clean up your code from the mess caused by all those callbacks; making your code more manageable.
Pro Extremely lightweight
Koa is very lightweight with just 550 lines of code.
Pro async/await keywords are supported and has transcended beyond generator functions
Generators functions are of course a huge plus, but at the time Koa team has transcended generations functions and shifted towards async/await style programming. It has made the Koa best framework available in the market.
Pro Development team has a proven track record
Koa is developed by the team behind a widely used node.js framework (express.js).

Pro Built for ES6
Pro Based on Laravel PHP Framework
If you are already programming in PHP with Laravel, you will have no trouble starting development with Node using Adonis.
Pro Similar to Rails
Pro Built-in modules for everything
There are built-in modules for everything: Auth, Social Auth, mailing ect
Pro Very good documentation
Pro Has websocket support out of the box
Pro Easy to learn, especially if you're already familiar with Laravel
Pro Option for full-stack or api standalone implementation
You can choose to use the full-stack version or if you wish to build a RESTful API you can choose to use the api standalone version.
Cons
Con Community is relatively small
Con Not compatible with express style middleware
Koa uses generators which are not compatible with any other type of Node.js framework middleware.
Con Has no routes separated by HTTP method or URL pattern
Con Wrong Middle ware, security issue
Con No NOSQL integration
Only used ORM, not ODM.
