Best widely available classical catechism: The Baltimore Catechism. Grade: A+
Best contemporary catechism: Faith and Life series (Ignatius Press). Grade: A-
Best catechism I have ever seen: My Catholic Faith, by Bishop Louis Morrow. Grade: A++. It is just outstanding, and can be useful for children and adults learning the Faith. The basic discussion in larger type is geared toward younger people, while expansions on the main point are in smaller print and geared more toward older readers or those wanting more -in depth answers. Originally published in 1949, the 154 edition is currently published by Sarto House. Unfortunately, Sarto House is a publishing arm of the SSPX, so, depending on how strict you are about not giving them money, it may be necessary to get a used copy. I’ve seen a few on E-Bay.
The full title of the book is “A Manual of Religion - My Catholic Faith - A Catechism in Pictures.” The “in pictures” part is a bit misleading, though. All it means is that each topic has a woodcut-style or black-and-white drawing at its head that illustrates the topic matter. It’s hardly a “picture book.” I think it’s a masterpiece, and can’t recommend it highly enough!
Oops! “154” = “1954’ for the year of the currently published edition.
Just checked E-Bay, and there are three there right now. And the Sarto House issue is a non-factor, since they are originals printed in 1956 and 1961.