I've not used S-23, but I've read more mixed results with S-23 than with W-34/70. I've used W-34/70 several times and as with Tonedef, I can't tell the difference between W-34/70 and WLP830. It's a great yeast... just pitch 2 packs per ~5 gallons, rehydrated, and cold (beer and yeast slurry @~50°F) and you can't go wrong.
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