Which sweetener

I thin’ I’ve tried every one available in the U.K.

Non artificial

Stevia - tried several brands always an aftertaste
Eyrithritol - works in recipes but not in drinks. Some taste a cooling aftertaste I don’t

In baking I use a combination of both the above

Liquid monk fruit drops - expensive and have an aftertaste although not as strong, allegedly granulated is better.
Xylitol - higher carb than most of the above but best of the lot in tea. Lethal to dogs
Malitol - in low carb bars spikes my sugars and more absorbed than most sugar alcohols

Artificial
Sucralose - most normal tasting I’ve been found but has all the “artificial “ issues

Whichever you choose check ingredients for hidden carb bulking agents eg maltodextrin