I can't say it follows for me at all that artificial sweetnerer elicits a sugar craving, and further, I don't see why the logic wouldn't apply to stevia if this was true.
I'm doubting too the supposed insulin response of artificial sweetners. Many comp dieters use them (eg Layne Norton says they are a good appetite suppressant on a cut), and moreover, if they had an insulin response, why not use it PWO for a "free" insulin response.
I guess its individiual. In addition, I'd used a calorie tracker so I'd know if I was eating in excess. If you feel or perform better without them, obviously scrap them.
If I have cravings, it will normally be for savoury (large indian dishes, pizza) or nuts. If its sweet its normally fruit related too (mangoes) which isn't too bad anyway. Would have actual sugary foods maybe once per 3 months (apart from fruit and milk sugar, the latter which I do get a lot of)
Splenda is an artificial sweetener and Stevia is natural.