I do not think I can recommend Appcelerator at this point due to the issues with Appcelerator studio, lack of good debugging support, lack of thorough documentation and forums and the additional cost overhead of licenses. The pros are just that it allows for cross-platform development. However, Cordova does a much better job of it and excels at places where Appcelerator currently struggles
Appium works well for well-structured mobile applications test automation that is particularly easy to leverage when different pages of the app use similar building blocks. If it takes time for some content in the app to be rendered, ask your dev team to add progress indicators and ensure they are accessible. That might be more complicated to do with Appium, though, if there's no good contact with Dev team established so you can request accessibility IDs added quickly enough when needed. Appium supports another locator strategies as well though (such as xPath or iOS class chain on iOS) but they wouldn't work as fast so you may get really slow tests.
It is very hard to debug your code. Breakpoints never worked for us even with the latest Appcelerator Studio and we had to rely on log statements to debug.
There is a need to purchase licenses from Appcelerator to run the code on a device or for creating iOS distribution builds. This is an additional cost when you have already paid for Apple developer program for precisely these things.
If things are broken due to lack to support between Appcelerator and a new iOS version, you pretty much have to rely on a new version release from Appcelerator for the issue to be fixed.
It is difficult to create enterprise distribution builds where the distribution certificate is owned by your organization's team and you only have a development certificate for the same.
The forums on developer.appcelerator.com are seldom helpful. It is hard to find solutions for issues even on other forums like stack overflow.
There are a number of expected methods that are not implemented, yet. With a similar sounding name as Selenium with similar functions, people who are familiar with Selenium try to use methods that appear to be available, but give a "not yet implemented" exception when run.
Documentation can be confusing.
Setup was a difficult process. This may not necessarily be the case once you figure everything out, but the whole figuring it out process was difficult and I ran into many, many problems when I first started.
I would like to give 9/10 rating to Appium because of it can easily integrate with popular frameworks and CI/CD tools, as well as it is reliable, flexible and easy to use. The setup can bit complex in initial step, but once on configured it's very easy to use and enables stable and scalable mobile automation for real and cloud devices.
Appcelerator makes you write a structured code whereas Cordova just packages your code and you are free to structure it. Appcelerator bridges your javascript code with native code and that would make it run faster than javascript code in Cordova apps. However, with recent mobile browsers, you would hardly notice any performance deterioration with Cordova apps. Appcelerator struggles with issues related to its IDE, debugging, documentation and forums and additional costs. Cordova makes it much more simpler to develop cross-platform apps with better developer support, debugging support, documentation and forums minus the additional costs.
Most of mobile testing tools which are available in the market are paid license tools. But Appium is Open source mobile testing tool. We can create customised automation framework using Appium. It also supports various languages such as Java, Javascript etc. And also supports various operating systems such as Android, IOS etc. We can easily integrate Appium frameworks with CI/CD [Jenkins, Git etc].
We were able to build and deploy a mobile app with Appcelerator. However, the platform still has issues and does not cover our needs as much as some of its competitor like cordova does.