no, the preferred one is just Pharo. 
PharoS is “Pharo Stack” (non cog)

Esteban

On 10 Feb 2014, at 22:08, Bruce Prior <b.prior@ieee.org> wrote:

I see that VMs for Pharo now come in two flavours (at least, for Mac OSX): Pharo.app and PharoS.app. Is PharoS now the preferred VM?
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