I bought a Kindle paperwhite around 2 months ago after thinking about it for about 2 years. I preferred the paperwhite as it is just an ebook reader and I prefer to keep my technology separate. Plus the battery lasts for 8 weeks so not necessary to take the charger on holiday. I work occassionally in a local hotel and the one thing that everyone leaves behind are phone, toothbrush, tablet and any other charger. So apart from the inconvience thats extra expense.
I believe the Fire is a combination tablet and ebook reader with a shorter battery life
I love my Kindle and wish I bought it a long time ago. I have also been writing a book for the last 10 years but never thought it would be published as it wasn't big enough, despite it being accepted by a publisher. But when I looked at the books on Amazon I realised that I could publish and do it all myself, i.e. design the cover and upload without using or paying a publisher. If I hadn't bought my Kindle I would have never known this.