I have both types on different bikes and for me it's 6 to 1, a half dozen to the other, I like them equally well. Decent GripShifters are relatively inexpensive should you have to replace them eventually and at that time you can easily replace them with trigger shifters. I had to replace them on both our 1997 TREK 820's after about a year or so but the replacements which were a better grade of the same brand are still going strong in 2014.
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".....distasteful and easily triggered."