i've used both splenda and stevia for over 3 years and have noticed no adverse effect
both are sourced from natural resources
splenda from table sugar
and stevia from a plant
splenda is readily available and is popping up more frequently in the marketplace
stevia is very cost prohibitive and rarely added to most store bought items
it's up to you bud
i carry packages of both with me when i go out
and i use splenda for baking and cooking
and stevia for my ice tea
your pick