I had heard that pre level ten vs. post level ten the upgrades get better, but it still appears that you're always better off finding as upgraded a wild pokemon as possible, then evolving from there.
I won't know for sure until the experiment is totally done, but so far it looks like almost 30% higher CP totals.
Google is your frenemy.
Caveat Emptor - Latin for tough titty
I tend to interpret things in the way that's most hilarious to me
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