So I think I figured it out. The Delta's are just flattened and the Rays are a full bladed profile, other than that, they are the same. I think the Chinese vendors use them as a cheaper OEM option when building up hundreds of wheels. That being said, Peter's price only varies by $.05 USD per spoke. So it was pretty easy to spend the extra $3.20 and just go with the CX-Rays this time. If I need to get replacement spokes (yes I got 8 extra from Peter) it should be a bit easier to find a match here in the states and not wait for international shipping.