Buy the bike. Barring illness or injury, you are at least 20 years, and maybe 40 years, away from it being an issue.
There is also a big advantage with the taller frame - you can get the stem higher. You probably don't care about that now, but you likely will in years (perhaps decades) to come, flexibility wanes and "slam that stem" becomes a form of medieval torture..
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"I'm in shape -- round is a shape." Andy Rooney