keep it and use it (unless you have a dlore) you'll get more kills and rank up quicker.
I normally use my Worm God, but might trade that one up. I have like 20 pink weapons and don't generally know if the trade up's are worth it. I have done a few that have been worth while and others were pointless.
If there was something that you could test a tradeup first that would be good.
 
	 
  
 
		 
 
		 
 
		 
  
		 
 
		 
 
		 
 
		
 
	 .
.