Ditto to 22B's post above - and a word of caution: EPGY is a standard, solid math program (and much better than those found in most schools in US), while AOPS has more difficult, 'deep' math.
Absolutely. AoPS is ultimately superior for gifted mathy kids. It's just that if one needs to learn (or solidify) the elementary school math, EPGY gives a quick way of getting it done, then switch over to AoPS when one is ready for a challenging prealgebra or algebra course.
Hopefully in a couple of years AoPS will have their grade 2-5 beastacademy.com series all written, then one can switch to AoPS earlier.
