Skamito, DaVinci Gourmet makes the Atkins' syrups under contract (and I presume to Atkins' specifications). They are basically the same thing except (and here I'm going on the only bottle I've ever seen) that there are fewer flavours of the Atkins (they pick their flavours), the flavours are natural (not necessarily the same) and the sweetener is Splenda (the same).

I also can assure you that the Atkins bottles are only available in the smaller size and at a higher price for the same size.

Atkins Nutritionals picked DaVinci Gourmet because they pick only recognized quality.

Your choices... hope this helps.