Neu - Y versus D windings

[VintageMA]

How to decide?

My question is in regards to BL motors with Y and D windings - specifically the Neus because they are the main brand I know to (aside from LMT) that make their motors available with both Y and D windings.

When you look on Neus motor page for the 15 series:
http://www.neumotors.com/20061222/1500_series_.html
you see that they have both a Y and a D winding version of each model and the D version seems to have a KV of ~1.77-1.78 times that of the Y.

But what does this really mean? Does it means that the Y windings are going to have more torque than the D windings?

Here's and example from another angle:
1515/2.5D = 1650 KV
1515/1.5Y = 1500 KV
Take the above two motors, the KVs are very close so in my mind ignore the difference in KV for this example. What is going to be the difference between two very similar motors one with a Y winding and one with a D? Will one have more torque than the other down low? Will one have better power at higher RPMs?

I'd really like to know because it would make the already tough decision process for picking a buggy/truck motor much easier.

Thx all.