A reasonable comparison, Paul. For myself, they represent two different styles of shooting. The T10 and 27mm are more businesslike, the 100T more contemplative. The 100T does have a faster lens, slightly wider, and just as compact. The 27mm, on the other hand, is in my experience one of the sharpest lenses in the lineup. The autofocus on the 100T is no slouch either.
Perhaps having both is ideal...
Will