What mobile computing device to use ?

I do most of my daily tasks with cell phone and tablet while on the go, not everyone knows modern cell phones and tablets are quite powerful, but I still want a real computer which is small enough for daily carry, that can handle what I will do with computer. Modern phone/tablet apps can do most but not every tasks we will do on a real computer, there are limitations. Currently I found the uConsole, which is running on a Raspberry Pi, with a full keyboard, great display, and supports 4G cellular, only that it relies on the unreliable microSD card, internal emmc is not well supported as system drive, and limited to 32GB, the unit is mainly for developers. I wonder if there's other option for me, and I will need the cellular connectivity, any comment ?