Out of the box a Defender will always be a better performer off road. Disco 3 needs all terrain tyres at a minimum. Spend a few dollars on both vehicles and the D3 would only lose out where weight is a disadvantage.
Different vehicles for different tastes though and while the Defender may win in the outright 4wd situation the D3 driver will be in an environment that is quiet, comfortable and doesn't leak 
Of course there is also the difference in purchase price that makes a difference, Puma +10K Difflocks, tyres, modest lift = high 50 thousands
D4 + 10K Tyres, Suspension mods, tyre carrier = High 90 thousands.
We have a D3 and a Wrangler. There is very little difference in outright capability but the D3 is a much nicer vehicle for a long trip at a $40K premium from new. I like driving them both equally as sometimes its nice to drive a vehicle that is light and nimble for a change.
Regards,
Tote
				
			 
			
		 
			
				
			
				
			
			
				Go home, your igloo is on fire....
2014 Chile Red  L494 RRS Autobiography Supercharged
MY2016 Aintree Green Defender 130 Cab Chassis
1957 Series 1 107 ute - In pieces
1974 F250 Highboy - Very rusty project 
Assorted Falcons and Jeeps.....
			
			
		 
	
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