Is there any reason NOT to take the 15 hour T train in a Deluxe two person sleeper vs the "faster" 12 hour D train in similar accommodations, aside from the difference in timing? The D trains arrive around 7:30am, which is actually too early for us vs. 10:30am which is preferable.

I presume the cabins are comparable...?

Is there anything "nicer" about the D train itself vs the T train? Amenities, smoother ride, fewer stops, better air conditioning, etc.?