OM651 OM642 Shelf life

Hello dear stars, I am looking forward to the decision to give me an S212. What about the durability of both engine variants? Can you say that the 642 is a bit more durable? Would you buy a 651 with 120k km or a 642 with 150k, if there are no other differences? Both have the 7g-Tronic, I assume the 7G-Plus variant at BJ2013 at each time? Is the automatic delivered at 642 higher loads and cold Is it probably less long or is it another one at the 642? Looking forward to your predictions and opinions…