I love my iPad mini 5! Years ago I had the first iPad mini and then the second....and after that stuck with the larger sizes. A while ago I started thinking about how a Mini would work out really well now for travel in conjunction with my 12" MacBook, and got an iPad mini 4 on sale and found that yes, it worked out fine for that purpose, so as soon as the long-awaited Mini 5 arrived on the scene, I jumped at one. My little Mini 5 goes with me around town, too, since it so easily tucks into a purse or bag, and it's great for use in bed at night. Just the right size for an e-reader!
I have the cellular data one because it seemed logical to me that an iPad which frequently leaves home might be more useful with cellular data than without, and that has proven to be the case. I much prefer the larger size for reading to what I can read on my iPhone and it is easier to type responses to texts and emails on it, too. At home I often use the larger third-generation 12.9 iPad Pro, too -- depending upon what I'm doing and where. That's the one which goes out on the deck with me in warm weather.