I'm not the biggest fan of Fathom - I think they're OK but could have been better. However, the BT Aqua deck was part of the early batch, including Fire and Lava, that had plain-Jane faces and a totally screwed-up finish that lasted barely long enough for you to get the tuck box open! I have to reluctantly vote Fathom. But I can't say enough good things about the newer Transducer decks - freakin' awesome, gloriously intricate pips, beautiful backs and the finish the earlier decks really needed and deserved. Here's hoping that those first three BT decks get a "version two" makeover sometime soon.
BTW: Quadfather - you forgot to vote in the poll.