I started noticing that different deck artists/LWB writers gave different interpretations of the same card, oh, about the time I started collecting decks. I really don't worry about it too much. I memorized the RWS interpretations years ago, promptly forgot them, then got hold of a copy of Richard Roberts' book Tarot and You, currently back in print as The Original Tarot and You, which totally changed the way I read the cards. I started reading the image I saw on the card, rather than going by what The Book (or LWB) said, and started getting better readings that way. It's a lot less hassle, too. No more looking up the "meaning" of a given card that I've forgotten, only to find that the "meaning" has nothing to do with the question I'm asking.
What I do now is, when I buy a new deck, before I use it, take the LWB and read each card meaning side by side with the actual card. Then I put the LWB back in the box, put the box in a drawer, and... read the images I see on the cards, with the LWB meaning as just one of many possible meanings for the card. My intuition may lead me to the meaning in the LWB that came with the deck, the RWS meaning, the Thoth meaning, or something completely other. I just let my intuition guide me as to what the card is trying to say to me.
You should see me reading with my Bosch Tarot sometimes. The Bosch is a great deck for reading intuitively, and the meanings I come up with for the cards are usually totally different than the ones in the LWB. I just figure, the LWB isn't the one doing the reading, I am, and the LWB can get stuffed.