I have one bike with each. For touring, I prefer the bar-ends for numerous reasons:
- No cables to get in the way of your handlebar bag.
- Can see or feel what gear you're in by looking at or feeling the shifters.
- Easier to make wide shifts (useful at the end of a steep downhill that goes directly into a steep uphill).
- Easier to operate with heavy gloves.
I know many others prefer the brifters, and if you get campy, the cable problem goes away. You can pretty easily adapt to either system. I don't find moving my hands down to the levers to be an issue.