I have experimented with stevia, erythritol and allulose and find the all have good uses. Combining stevia with the sugar alcohols in small amounts gives them a boost in the sweetness that the sugar alcohols are missing compared to sugar without the bitter aftertaste. This is why many commercial alternative sweeteners are combinations of 2 or 3 sources. Also allulose and erythritol react quite differently in the same situation. Erythritol has a max absorbsion capacity in water so making simple syrup is not an option with erythritol. It recrystalizes when it cools if you try to put more than 1/2 c into 1 cup of water. Found this out the hard way making a big batch of cowboy candy last month. (Candied Jalapeños). They have crunchy crystals in them instead of syrup. Also it will not dissolve well into some other liquids like vinegar. As someone else said allulose will caramelize like sugar so good for candy and browning purposes. I have had no dissolving issues using it with soy sauce or vinegar in Chinese style stir frys. I got a 2# bag for $18 on Amazon. Since I don’t really do the keto treat thing much it lasts me a long time and I found it worth buying.
https://www.amazon.com/gp/aw/d/B07HJGHLXT?psc=1&ref=yo_pop_mb_pd_title