Either way works. From the play store you can pick and choose what you install and can be uninstalled without jumping through hoops because they install as user apps. When you flash gapps, they typically go in as system apps and are a bit more troublesome to get rid of if you don't want everything in the package.
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Three out of four voices in my head want to sleep. The other wants to know if penguins have knees.
First you forget names, then you forget faces, then you forget to pull your zipper up, then you forget to pull your zipper down. ~Leo Rosenberg