The problem with agave is that it's almost all fructose. It's "natural", but when you get down to it, so is HFCS, and it's got about as much fructose in it (sometimes more).
There really should be a push for them to retest stevia in the EU. It's been used in Japan for a long time with no evidence of ill effects. In the very least it deserves a re-evaluation.
Bmore, Xylitol is a sugar alcohol, but it's one that doesn't seem to cause the gastro-intestinal side effects other sugar alcohols do.
I use AS, but I use it sparingly. I am working on cutting down on refined sugars, but if I absolutely needed something sweetened and I was convinced AS were unsafe, I'd use a small amount of cane sugar or honey.