I rarely use one sweetener exclusively, but the most common mix of sweeteners I use is Splenda and granulated erythritol. It works incredibly well together for baked goods and all sorts of other things. One thing I love about erythritol is that, in granulated form, it simulates the weight and feel of sugar. That makes it really great in recipes where, for example, you're asked to cream butter and sugar. Splenda doesn't really work well in those.
One thing I haven't tried yet, but did buy, is powdered erythritol, which is supposed to work like powdered sugar. I've made the Splenda version of powdered sugar and wasn't pleased with how it worked, looked, or tasted.
I'm hoping the powdered erythritol will be better!
Just haven't found anything to try it on yet...
Thanks for your wise posts, Zeff, as always.