Best Course Aspect Ratio for Viewing on an iPad

I am creating some technology courses that will include screen recordings. I am wondering which aspect ratio would perform better, 4:3 or 16:9. The course will be on an LMS and will be published for mobile use such as an iPad.  Any suggestions on which ratio works best when viewing with an iPad. Does the Articulate Player App solve the aspect issue of black bars if the course is launched on an iPad?  

 

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