Superclean is stripped down, Blackhole is more of a build your own. At least that is how I see the two.
After trying both, right now I have Super Dark ROM v1 running on DJ05 (stupid fast kernel). I find it snappier than either black hole or super clean.
Please note that I'm still on Dj05. I haven't flashed DL09 nor do I intend to. I'm just waiting for a stable froyo ... patiently.
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Have you tried Froyo yet? I'm running Super Clean .8 and so far I haven't had one force close or anything. Seems very stable. More stable than my experiences with DJ05 in fact.