SMP.. Why is the 2500D movement better than the rest?

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What’s the difference in SMP 2500 movements? Why do they say that 2500D is better than the rest?
 
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I believe the 2500C movement had a two-level escapement wheel, while the 2500D is a three-level.
 
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What’s the difference in SMP 2500 movements? Why do they say that 2500D is better than the rest?

The 3 level co-axial escapement is the only difference. This is a far more reliable design than the 2 level that was used in the previous iterations.