hnm
I think for this particular thing,, it is best to pick a diagram that makes sense to you,, and long ago , I even picked one that was different.. but I didnt' explore it further for I moved on other things.
what I would do is pick the golden dawn path,, study why it went like this,, and then look at the thoth,, and waite version to see how they moved from there.
one book I would look at is the qabalistic tarot by Robert wang, for it compares the golden dawn, to the waite and thoth tarot.
but as the moderator Zephyros says, it is more then that,, to truly understand is to study it very much in depth. and ask yourself why are you studying it. .
what I mean is,, how do you think it will work for you in a tarot reading. are you just interested in self study and using this for self growth ? .
and one thing you will realize as you study this should you decide so is astrology and other things also figure into it.
oh another book that is very good is the chicken qabalah written by lon milo who also wrote a very good book on trying to understand the thoth system as well.