Cokes contain much more crap than just the artificial sweeteners that are in NAS squashes and that's why the squashes are seen as a better option. To be honest though anything sweet will trigger the cravings for sweet stuffs. That's why I baulk at people eating sugar free sweets and cakes, they may contain no sugar and little fats but it's a behavioural thing with me. My head knows they are sugar free but my mind tells me I'm eating sweets and cakes and it's OK. It would be only a short time until I'd be on the real stuff.
I've seen a brilliant WLS post opper here who had their head well sorted but even they succumbed to the bad behaviour in time and started eating sweet stuff resulting in a weight gain over time
We have to modify our behaviour and that is so hard to do and anything that can undermine that makes it harder. For two years I only drank Volvic with a hint of lemon and coffee