The Delstar is just way more advanced than the Omni.
Its a different ball game chemically as the prices would suggest.
Your question about durability, yes the Delstar is going to be better BUT Basecoat/ clear is going to be better yet. (even the omni)
Are you doing this because your on a budget? Tell me what you want to accomplish here and I can tell you what omni vs ppp items to use.