I've owned a Tab 10.1 (great screen, expandable storage) and an iPad 2 (currently). Even though I'm on an Android phone, I prefer my iPad because of simplicity, the accessories ecosystem and the (literally) no-brainer integration back to my MBA. After being an uber-geek for so many years, I find myself using my phone these days as ....... well, a phone. I call people and I text. I love my Droid Turbo's stock keyboard, hate my wife's iPhone 6 keyboard (hence why I'm rocking the Droid these days). Anything else generally gets blown off or put on a to do list until I get back to my iPad or MBA or desktop. Of course, I am 50 and also have beaten cancer twice now so I don't get wound up about details like I used to either
So, to get back on subject - dropbox or evernote is my preferred storage. EN offers offline storage (user definable) for a ridiculous amount of data. It handles all of my offline needs. I also find reading (magazines, articles, pdf, whatever) better on the iPad. Guess it's the aspect ratio as others have mentioned. With LTE and VZW 10GB data plan, I don't worry about local storage on the iPad other than music and that's a no brainer obviously via iTunes (getting music organized from pristine 96/24 FLAC to smaller, lossy and worse sounding aac files for on the fly listening? that's a different story).