Aurelia integrates well with other web technologies, thanks to its compliance to web standards. If you want to use external libraries, such as jQuery, or other frameworks such as React, Aurelia won’t hinder you.
This framework has a major focus on being all-inclusive and consistent. Provided out of the box solutions for major web application features like routing are solid, an important sticking point for teams that value consistency. It ensures that all Mithril Apps are consistent and similar, and don’t vary too wildly.
Alternatively, Mithril provides a framework comparison page that compares it to React and Angular, which is a good read if you’re familiar with either of those frameworks. Check it out here!
As a result, Svelte is incredibly performant. In the words of Rich Harris, Svelte creator:
It's basically as fast as vanilla JS, which makes sense because it is vanilla JS – just vanilla JS that you didn't have to write. (source)
Again, this framework is very different from the preceding ones, as it is not a front end framework for single-page applications. Ionic is designed to make your mobile app codebase compatible with all mobile platforms, as well as making it easy for web developers to get started with mobile app development. It does this by providing a platform to use Angular, React, or Vue on any mobile device by simulating a browser window.
Depending on the purpose of the application you want to develop, you may want to put a lot of thought into what technologies you want to use. Aurelia, Svelte, and Mithril all put their best foot forward, offering feature-sets that are unique enough to clearly distinguish them from each other. However: they also all aim to solve the same problem, and provide tools for building similar applications.
Ionic stands out in this regard as a framework that actually fills a gap in the market for hybrid mobile applications. It also supports the much larger, more popular frameworks, allowing developers who are more familiar with them to hit the ground running. In my opinion, this makes Ionic far more interesting than the others listed here.