The best one is the one that hasn’t come out yet. (That’s my attitude, seriously, as I’m waiting for the next generation of Chromebook.
I have the first generation Kindle Fire that came out in 2011. Use it every day to access Facebook, Weather Channel, and You Tube, some games, have downloaded many conservative books. Great for streaming many free TV shows and films. The second generation Kindle Fire with SKYPE is even better altho I may move up eventually to ASUS for SKYPE and their attached keyboard. A friend was raving about ASUS today.