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I would go with the smaller frame however eff top tube length is only a start. Can you get the correct saddle height, setback and saddle to bar drop? Then be mindful that vendors change sizes of crank arms, bars and stems with different frame sizes. Although for a 53 and a 55 they may all be the same.
 

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If you follow another thread on the forum, if you post your measurements, I will run my program for you.
 
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