In my experience starters are the norm and finishers are less common. I personally am a finisher, it drives me insane to leave a project incomplete. People who are "starters" I find tend to view themselves more as idea people who are maybe not great at execution - and that is true sometimes. But there is a fine line between a starter who is a creative genius -vs- a starter who is lazy and dumps all the annoying finishing tasks onto somebody else's plate. There are also starters who organize things so that it's easy to finish them, and there are starters who leave gigantic messes and problems with no consideration about the finish work necessary.

I have a great partner in music who is very creative but has trouble finishing things. The two of us make a great team. But, there will be times where I get mad and make him do some finish work. Just because I like finishing things doesn't mean I never have any creative ideas and want to do all the boring, dull cleanup work all the time!