More competent people will reply however, in general the 0W has a beefier additive package then the 5W30. Now, even beefier is the 5W30 Diesel/gas oil they sell if additive packages are what you are looking for.
The 0W seems to hold up longer for extended drains over the 5W, If you are going for short OCI, say under 7500 then the regular synthetic is more cost effective then the 0W or 5W diesel, about $2/quart diff.