Most readable deck
I love the amount of variety in the choices here.
I only have 11 decks, I am super strict and picky about allowing a deck to join my collection and I must be sure I will work with it. If not, out it goes. So, I guess I find all my decks really readable.
That being said, I use the Sharman-Caselli deck and Commemorative Smith Waite deck mostly for study (I'm still a tarot noob) but I always end up reaching for the Tarot of the Magical Forest or Deviant Moon (borderless) for readings/play.
I've yet to get really stuck in with my Bonefire and Ellis decks but so far I am enjoying them.