To add to the list of ignored opinions:
Card College is cheaper...has been time tested...and many swear it to be the only book you need on card magic. It is a book that one can read over a few times and find something great in it each time. Some of the effects are classics. The only down side - some of the effects and sleights are dated (like the glide), but that doesn't mean you won't gain a solid foundation in card magic.
Card College is exactly that - a set of books teaching you progressive card sleights, it is organized well, and the theory is taught very well. The effects are good - the only problem is most effects won't use anything that hasn't been taught - which explains book 5.
Anyhow - I think they are both great. I have both - RRTCM and CC 1-5 (and the light set).
I don't think it is a fair comparison - one was invented as one of the original texts on magic, the other learnt from that and had more information at hand to publish/contribute. Nevertheless, the fact that RRTCM is still being spoken of, I think, makes it worth a 20 dollar investment - and it was my first book.
However, if I were to start today, and had the coin - I would get CC, because it is well thought out and a solid book in magic.
That being said - I don't know ANYONE who has bought one or the other - and with practice - hasn't been great with a deck.