Tough call. The Cheiftain has a multi-fuel engine designed to run on petrol, diesel or anything inbetween*, which could be handy, but in T2K you're likely to be brewing your own fuel anyway so that advantage is somewhat nullified.
However the Chieftain was also somewhat unreliable by all accounts, so I'm going to go for the Challenger 2 on the basis that its as well if not better protected than the Abrams, isn't as fuel hungry, and holds the record for the longest range tank to tank main gun kill at 5+km.
* I've heard about an enthusiast who runs an old Abbot SPG - also fitted with a multifuel engine - for practically zero fuel cost. When people accidentaly put petrol in their diesel car the tank and fuel system has to be drained. He's got an arrangement with the local garages to take this 'useless' fuel off their hands for free.
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