The advantage of the union system would allow for not needing to wash because there will be a greatly decreased amount of gunk to wash away.  I guess build it and see what way you like.  A small jug is all you're wasting.
I do it both ways depending on how strongly flavored the end beer will be. So stouts and IPAs I tend to use the whole thing. If I think enough ahead of time I will make it and decant the spent starter liquid off and just pour the thicker slurry.
								I do it both ways depending on how strongly flavored the end beer will be. So stouts and IPAs I tend to use the whole thing. If I think enough ahead of time I will make it and decant the spent starter liquid off and just pour the thicker slurry.
 
	             
 
		 
 
		 
 
		 
 
		 
 
		 
	 
 
		