Yep - a lot of recipes simply taste better with a combination of sweeteners. ESPECIALLY true for recipes calling for chocolate or cocoa - Splenda/sucralose alone just doesn't cut it.

I have actually found a sweetener that I really like, and I don't need to mix them anymore. It's all personal taste of course - I cannot stand the taste of Splenda/sucralose. I use Ideal sweetener, which is xylitol based. It has 0.03% sucralose for a bump in the sweetness. For a long time I was mixing xylitol and erythritol, but I found that the erythritol didn't "agree" with me