The hold is the same on both of the gels. The differences are the scent and claim benefits:

Olive Oil Eco Styler Gel- Aids in circulation to the scalp, stimulates growth.

Moroccan Argan Oil Eco Styler Gel- Maximum softness, brillant shine and manageability.
*Natural Childrens Hair Care Blog*
-Hair Type 3C mixed with 4A-