So coming from an individual who has both a mac and iPad system AND a mostly completed CS degree here are my thoughts:
If you are wanting to do some light content creation such as light video editing, light photo editing, and some typing as well as massive amounts of content consumption the iPad system is designed for this. It's arm processor gives excellent battery life, can be charged with battery banks, and is very portable. For most people I recommend they go the iPad route.
If you need an x86 operating system for the file management and or coding then the only option would be the macbook air. Intel's processors have been getting better over the past few years and 8th generation has been awesome, it is very difficult to max out the cpu unless you are a heavy multitasker or require a suite of software that taxes the hardware.
In the end: I recommend that most people go the iPad route, typically considered to be less vulnerable to attacks (i.e. Spectre and meltdown (although 8th gen "fixes" this)) and arm processors will probably find their way into macos some way or another. Both do email, web browsing, and general computing tasks with the same level of excellence except the iPad will probably last you longer in terms of battery life.
I hope this helps, and wish you the best of luck on your purchase (always get the apple care or apple care plus)