I have a 300Tdi and a Puma and I owned a Td5 Disco.  The Puma is excellent and has a lot more get up and go than the Td5 in the Disco did.  That said the Td5 wasn't bad either, but it does have turbo lag.  I can't compare gearbox's because the Td5 D2 was an Auto for starters and secondly even a manual D2 is a different beast to a Defender.  I will say the more I use the Puma off road the more I like the gearing rations over the Tdi.
Have you driven either?  That would be a good start.
Personally I like my Puma for a number of reasons and I'd buy one again, but the Tdi has more "character".
				
			 
			
		 
			
				
			
			
				MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
			
			
		 
	
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