With the various devices out there, I recommend you think about your primary usage. We have chromebooks, a mac, and a pc at home, with external hard drives and cloud storage. I use my cell most of the time though lol.
On the road a tablet would do everything we need, and look great when connected to the TV for watching videos or photo sharing. That's what I'd buy.
I can take anything into a cafe, from my cell to my laptop, so that's not a factor. Neither is charging via usb or to the inverter. Certainly the tablet is fully cloud based- but for email, news, some social and sharing pics, it'd be "just right" for this goldilocks.