[meeera]

The reason there is a bezel around the screen is that unlike a monitor, you need to hold the device. Having the screen go edge-to-edge (or nearly so) would mean you would be restricted to a palm hold, like a phone, which for most people is not comfortable for any length of time for a reader larger than five inches.

The next important question is: what do you read? A reader who reads mostly novels has very different needs from someone who is reading graphic novels and complex scientific papers.

Next: what country do you live in? Only one country that I'm aware of has Kindle library ebook borrowing. In all the rest, you need to look elsewhere if you're a library user. Your country will also influence what devices are readily available to buy.

Next: are you happy to read with someone else's ideas of fonts, and a limited choice of font sizes, line spacing, and margins? Or are you keen to customise quite finely to your own preferences?

Next: do you want a device that can sync up reading and audiobook listening with the same book, so that you can move from one to the other? Or is that a non-starter?

Next: are you expecting to end up with a large collection of books that you want to easily manage into shelves (collections), or are you a person who would just put a handful of books on your device and not be bothered about organising them?

Next: you mention colour, but also eink. If you want a decent coloured screen, you're looking at a tablet, not an eink reader. The tradeoffs there are shorter battery life, difficulty reading in sunlight, and (for some, not all) more potential for eystrain. The main pluses are flexibility (a variety of ebook apps and other apps), faster smoother reading of PDFs, and colour.