I've used various iPads, surface devices and android tablets (Samsung, lg, ...). At the moment it's an easy choice- the iPad Air feels great and is a brilliant all rounder.
Phones wise is harder- I loved my htc one, and now the lg flex (which took over from my note 3). I was impressed by the lightness and convenience of the iPhone 5s. For my needs I'd plump for the lg g flex.