To me Concepts has done a much better variety of models than J. Crew up until the past year or so, but since then J crew has been expanding into other models and now their first, and I'm sure not only 997.
Concepts has done 999s, 998s, so many underrated 574s, 997s, and randomly 1500s, 575s, trailbusters, 496s, 875s, etc.
J Crew's bread and butter has been their 998s, with a bunch of great 1400s, and 996, 990, and now 997.
Both are awesome but for different stuff.
Fieg not even in their ballpark with this brand.