As suggested, it really comes down to waht you want to use it for. If you need to carry more than two, you have to choose the Double Cab or wagon. 
On the other hand, if you need to carry chemicals which must legally be carried outside the passenger space, you have to choose the Double Cab, ute or trayback. 
If neither of these requirements apply, then you are not as constrained. For most people the need to carry at least occasionally more than two usually means the wagon or Double Cab are better, and in my view the wagon is usually preferred because the load space is more versatile - you can carry larger and longer stuff. 
You need to decide what your priorities are.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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