Which truck would you choose

Needing some advice and not wanting to start WWIII. I have narrowed down my choice of trucks. One is a 2006 f250 with 6.0. it has been gone through and bullet proofed at 227,000 and now has 236,000. No tuner and has never been used a tow vehicle. Trans has been serviced regularly and shifts very smooth but has never been rebuilt. He has all the receipts from engine work.
truck 2 is a 2008 dodge ram 2500 mega cab with 6.7 cummins and 68rfe trans, with 147,000.Engine has been egr deleted. trans is stock. no tuner has been ran on either trucks, both 4x4. i have never owned a diesel before. just wanting to know your thoughts on longevity of both drive trains. both trucks are very clean and been well taken care of. thanks in advance,steve