Hi Bec, and welcome!

My opinion about the sweeteners: for hot drinks etc, I use Splenda tablets. Almost no carbs (0.075 per tablet) and they taste reasonable. I find xylitol on its own has a kind of "numb" taste. It is also pretty expensive.

For baking, by far the best solution I have found is to use half xylitol and half Splenda. (I only ever use the tablets - they grind up simply and easily.)
The beauty of mixing two sweeteners is that (a) the taste is MUCH improved. Even my picky DH can't tell the difference between that and sugar, whereas he pokes his nose up at Splenda sweetened stuff,
and (b) using two sweeteners has a synergistic effect, so you only need half as much total sweetener....thereby saving dollars. For example, if a recipe says 1 cup sweetener, you only need ¼ cup each of Splenda and xylitol (which equates to 12 crushed Splenda tabs).

All the best, matey.

Roz