I would recommend asking them. For example, Stevia and aspartame don't bother me, but Splenda (aka sucralose) causes terrible side effects for me. Heart palpitations, dizziness, nausea, migraine headache, feeling faint, etc. It very nearly sent me to the emergency room once. I have to read every label carefully. Sometimes Splenda is even in things that aren't labeled as being sugar free or low calorie, which I was surprised about (some of the ready-to-drink Kool Aid products, for example -- bursts or blasts or something like that).
Given a choice, I'd highly prefer Stevia, but so far I've been unable to find soft drinks made with it. I don't like coffee, but I "have" to have my morning diet soda!
I'm not sure Stevia can be used for baking, though. I think I read that it couldn't. (not sure ... ???)