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    $\begingroup$ Regarding your edit, according to the help files both PatternTest and Condition were introduced in version one. $\endgroup$ Commented Feb 16, 2012 at 15:18
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    $\begingroup$ I know nothing of the internals, but it is often quicker to write using PatternTest than Condition. Although, for complex conditions, Condition is superior. $\endgroup$ Commented Feb 16, 2012 at 15:21
  • $\begingroup$ @Mr.Wizard +1 That is helpful to know! Then this may be chalked up to the whims of the developers during those early stages of development. Although I do still wonder if both syntactic operators were added in version one, or just the functions... $\endgroup$ Commented Feb 16, 2012 at 15:24
  • $\begingroup$ I updated my answer with a difference between the two that I don't believe has been covered yet. $\endgroup$ Commented Feb 16, 2012 at 15:30