I started with Accelerade, then Accelerade light, with an occasional use of Gatorade. Then I started using Nuun, and Accelerade only for really long/hard/hot rides.
It all hurt my stomach. So, this morning, I ordered the Skratch exercise hydration to test, and then a 3 pack of the Nuun r naturals. The sorbitol and other chemicals definitely affected me, now that I look back. I prefer to get most of what I need from real food or Lara Bars, so I suspect I'll mostly be using the Nuun. However, I don't do well in the heat (how did I ever live in AZ?), so I am guessing that's when I'll use the Skratch.