You're going to get twenty different answers to this question, but choosing a 1:1 dilution over Stock developer is going to have a very subtle effect on the negative. When working with D-76 (a solvent developer with lots of Sodium sulfite in it) diluting the developer has the effect of decreasing contrast slightly, while increasing the apparent grain and slightly improving acutance.
I suggest you read this discussion for more thoughts on the matter.
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