Well suited: for interfaces between machines data and applications. Made as a service. For web applications in factories where you don't have access to thick clients due to the environment. not well suited: quick measurements and fast data transitions between different applications. When time dependency is needed, then you better can choose other solutions.
Yii is very well suited if you love to program with Object Oriented PHP. This framework uses OOP very well and if you know this pattern you'll love it. The same applies for its MVC architecture and if you come from formal software development education. Also if you are in a bussiness enviroment and need a stable framework. This is the tool for you. It uses very formal scheme but I would like more open and hackable framework, and for this Yii2 is not a good option. Also, if you like to have bleeding edge technologies I don't recommend this framework.
I think is really easy to use, it's not perfect but many developers with great experience will know how to exploit this framework to create great apps!
It's has a really good support based on online documentation and official forums. But sometimes I wish there were a paid service where to report some urgent issues.
We choose ASP.NET because our core business is working with the SAP HANA database using SAP Business One. We can develop state-of-the-art applications with Razor and Visual Studio 2022 fast and with excellent application performance response. Working SAP Hana with JAVA could be more challenging because it has fewer developers communities, and it could be harder to find a solution for a question.