If it's ONLY between tip or shaft, it's shaft. Some will probably say that a smaller tip let's you get under the cueball more, or a softer tip grabs better, however part and parcel to that dynamic is the stroke(which is not part of your question). 
But with a lively shaft, you can draw even if you have the stroke of a pregnant moose.
				
			But with a lively shaft, you can draw even if you have the stroke of a pregnant moose.
			
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		 Or at least partially the answer... and practice, practice, practice.
  Or at least partially the answer... and practice, practice, practice. 
 
		 
 
		 
 
		 
 
		 to the diameter of the tip.
 to the diameter of the tip.  
 
		 
 
		 
 
		 
 
		 
 
		 
 
		