Wow, nice job Newegg :] They're pricing it $10 below MSRP. OWC has it $80 over. Typical.
The warranty is through Western Digital, not the retailer. So Newegg's warranty is the same. Unless OWC is lying about the warranty, which they have in the past.
From NewEgg, the drive is OEM, which means no box, no cables, etc. Therefore, it would seem that the drive has a 3 year warranty:
http://support.wdc.com/warranty/policy.asp#policy
If OWC is selling a retail version with box, cables, etc, it has a 1 year warranty.