I'd say Delco syn blend is better, just because it's a syn blend that isn't no-name. (Not sure who GM buys it from but they do have some reputation to be concerned about.) I trust Valvoline products as much as any comparable brand, but IMHO we have so many affordable, superior alternatives to straight conventional oils of any brand that I only use it in tractors and lawn mowers. However, I'd choose MaxLife over either.