The reviewers before this one provide excellent discussion of this set, and I would agree that it is a top-notch set of recordings and performances. We love this set, play it often, and would not part with any recording upon it.
The two versions of the popular and lovable Concerto No. 2 that are compared, those of Jean-Philippe Collard (this set) and Cecile Licade, are certainly different. Collard is decidely gentler, a bit slower and more "laid-back" in common parlance. Licade's is spritelier, a bit faster and of slightly higher energy. Does this make one better than the other? Subjectively it may, but it really depends on the person listening, and both performances are technically excellent and completely satisfying. If I *had* to pick one of the No. 2s, I would pick Licade because of the higher energy, but I would sorely miss Collard - and Collard comes with 4 other splendid concertos and a handful of other delightful pieces, while the Licade is paired with two other Saint-Saens concertos (violin and cello, both superb by the way) that are available elsewhere.
In any case, please do not feel that you are missing out on anything in Concerto No. 2 by purchasing one or the other - both are fine performances and beautifully recorded. None of these recordings or performances require any apologies.