I use both Splenda and Stevia. I grow and dry my own Stevia – it is quite simple. Stevia originating in China (the world’s biggest supplier) often has a slight “aniseed” taste – which is why I began growing my own. With regard to Splenda and some comments, I have seen here about people having diarrhea etc., in regard to any of the sweeteners – it is not an unusual reaction – for a day or two. Your body quickly adapts and is goes away. Animals experience the same thing when some things in their diets are changed. I like Splenda for taste – it is identical to sugar.
Aspartame is the one I avoid, it does not have a natural sugar taste and in me seem readily capable of triggering a migraine. It also has some very heavily disputed carcinogenic claims made about it – sufficient to have caused some governments to ban it.
As Aspartame is ubiquitous it was hard to avoid, but often when hit with a sudden migraine I would analyse my recent intake and discover that I had eaten or drunk something containing it. I now take great pains to avoid it. It does not affect my wife or daughters that way, but did affect my mother in the same manner.