Considering I've never used the Thoth I'm not sure if I should answer, but I prefer the Liber T over the Thoth. The Liber T is awesome! Scion does not post much anymore but he has written a guide of sort about the Liber T, if you beg him I'm sure he'd be happy to send you a copy. Also his enthusiasm and love for the deck have changed the opinion of quite a few people here on ATF about the deck, considering the deck was trashed by most people here when it was published. So much that Riccardo from Lo Scarabeo, who was planning to can the deck and stop its publication, changed his mind after Scion, and the new converted fans, publically voiced their voices against, mine included. In other words, grab a Liber T before Riccardo changes his mind
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My latest love is the Tarot of Vampyres. While I'm sure many disagree with me I personally think it takes a lot from the Thoth, including the quaballah.