Splenda seems to be the new hot sweetener and it certainly tastes better than aspartame or saccharine, but Sucralose (splenda) doesn’t break down in the environment, and has all sorts of nasty side effects to marine life.
Truvia is based to stevia, and is a great, if expensive alternative as long as you aren’t trying to bake with it.
Truvia comes from the plant stevia. It is made of rebiana, erythritol, and natural flavors. It is a stevia-based sugar substitute developed jointly by Coca Cola and Cargill. Truvias currently distributed and marketed by Cargill as a tabletop sweetener and as a food ingredient.
Splenda is an artificial sweetener that comes from sugar. Splenda usually contains 95% dextrose (D-glucose) and maltodextrin which the body metabolizes, combined with a small amount of mostly indigestible sucralose. The caloric content of a single-serving of Splenda is 3.36 calories, 31% of the calories of a single-serving of granulated sugar (10.8 calories).