Any help here would be much appreciated, since I haven't really taken any notice of tablets until now.

Got a 10 hour flight to Vegas coming up, so have looked into buying a tablet to get a TV series (such as sopranos or house of cards) on to watch on the plane. Other uses would be to have a tournament running on Stars when playing live in a casino (no, not in vegas ), some browsing and maybe the occasional game.

I originally looked at buying the current iPad, and then after going in the shop the 7.9in mini seemed like a big enough size. But 32gb with Apple doesn't really seem enough, and a mini 4 128gb is £419. Preferably, I would like to spend half of that but I wouldn't really care if there was a good reason to spend more/less.

Ideally would like IOS (switched to Android on phone and went back to Apple as I preferred IOS), but no memory card slot seems to be prohibitive.

Options:

Apple mini 4 32gb (£329) or 128gb (£419).. price is an issue
Apple mini 2 32gb £239, price seems good but will I regret the lack of storage?
Samsung Tab S2 (£329) 32gb and can add 32gb extra
Asus Zenpad Z580C (£219) price seems good and I can add storage. Would I notice the lower spec?

or anything else someone can suggest

Thanks

I would suggest you to go for the Samsung Tab S2, great experience with it.