Pink - Aerosmith
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According to Fermetis, dry yeast sachets contain other microorganisms:You're comparing a lab analysis to marketing lingo. All of fermentis' numbers are <X/mL. This is probably the lowest level they can detect. A lab analysis rarely says zero because the contamination may be there but at levels they can't detect.
Wyeast claims to be free of other microorganisms:
"Wyeast 100% Pure Liquid Yeast™ cultures are pure, single strains of yeast with no contaminants. Dry yeast can contain contamination by multiple strains or other organisms, varying between manufacturers and batches.
I don't know whether this makes a discernible difference in 5G of beer but, IMO, this makes liquid yeast better.
Brewing tonight...hoppy brown ale.
Brewing in Florida in August sucks no matter what time of day. Thought I would do better by waiting until evening but it's still muggy as hell and this was the weather earlier:
Another example of Florida brewing weather by ccfoo242, on Flickr