I figured it would be more a question of dilution and less of brand, but I also figured some brands would be more into 'classical' homeopathy, whereas others might be more likely to offer the less diluted versions.
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As to the rest, eh, if it gets proven true, it gets proven true :P At the moment homeopathy hasn't managed to prove an effect beyond placebos, but part of the problem is that studies done by pro-homeopathy folks tend to be slightly weak (not enough sample size, not double blind, etc) which counts against them in the eyes of the general populace. The whole field could benefit from some more rigorous studies, I think. Just because we don't understand the mechanism at this time doesn't mean we can't see positive results after all.