Well, you know what they say about opinions...
Here's my experience: I have both, I have bought every piece of 38 in my stash which shrinks every time I shoot it, conversely I have never bought a piece of 9 brass yet my collection continues to grow.
I'm with Foxbat, obsessing about my brass really takes away from my shooting experience. I'm not as good a shooter as Mike, so he can take my input with the appropriate amount of salt