What's your favourite artificial sweetner and why?

I’ve noticed that people tend to have brand loyalty, particularly when it comes to sweetners. I you use them, what’s your preference and why??
(scientific evidence and reasons always welcome)

I LOVE Splenda. It doesn’t give me an odd aftertaste and I like the texture. It also doesn’t have a bad reputation for causing cancer in lab animals, which is a plus.

I’d like to try more natural sweetners but they are rather pricey right now.