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If you are unsure then get the 256GB. I have the 128GB and that’s fine. I Upgraded from the mini 6 which has 64GB. I used that for 3 years and only used 30GB. I have a 2TB iCloud plan and I work from home so most of the time I have access to a good internet connection. Even with my 64GB iPad mini, I took it with me on vacations/trips and had enough space to store several movies and TV show episodes. I also have a 128GB iPad Pro which I actually downgraded from 256GB when I upgraded, because I was still using the same 30GB on my old iPad Pro. My iPhone is 512GB as I store more content on there.
 
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