I use stevia and erythritol either separately or in combination, initially researched for baking, and have no issue with them. My body appears to know the difference between these and
actual sugar, as I discovered early on when I had a few little sugar craving false hypos.
If you choose to go for commercially branded sweeteners, then check nutritional info for actual ingredients, as stevia which is extremely sweet often has additives and bulking agents added to tone it down, and some of these are definitely best avoided, though Stevia/erythritol combinations on their own are common and quite safe. I use Natvia available from Ocado and Tesco (who sometimes have good discounts), but generally buy the following from Amazon UK: Sukrin and NKD Living which both come in various options, e.g. granulated, powder/icing sugar, and brown. Stevia also comes in liquid form in a wide selection of little dropper bottes (I've used NuNaturals long term and more recently somewhat cheaper NKD) - useful for adding to drinks, but be aware that there are also flavoured varieties which may need a quick ingredients check.
Xylitol is often recommended for baking, but is specifically one to avoid if you're dog owner, as it causes severe hypos often resulting in their death.