Without looking at the link that laurabeth posted, I can say this...the Aubrey Island conditioner is much thicker & heavier in consistency than JessiCurl. Also, you can't get Aubrey unscented, and the Island conditioner is quite the scent extravaganza. For me, Aubrey products in general don't rinse out well and leave my hair very coated. I don't get that from JessiCurl.
I like a lot of the ideas behind the Aubrey line and I like that I can get the products locally, but I no longer use them. The products don't work well for me (I know they do for others) and I also got frustrated with the high degree of variation in product consistency & quality from one bottle to the next.
(my dogs aren't snarly, my hair is)