When comparing Wakanda vs Koa, the Slant community recommends Koa for most people. In the question“What are the best full-stack Node.js frameworks?” Koa is ranked 8th while Wakanda is ranked 9th. The most important reason people chose Koa is:
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.
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Pros
Pro Built for business web apps primarily
Wakanda with it's Model driven approach is a very good choice for B2B and B2E Web app, although that doesn't mean that it's not good for other kinds of apps, such as social media ones.
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
Cons
Con Low open-source community interest
Wakanda's community is pretty small. It has about 10 stars on GitHub and few questions on Stackoverflow.
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.