bike geometry and recommended sizing

Hello,

Anyone know about frame geometry. I refer to effective top tube.

At my height (5'9") I am recommended the small in Focus Izalco Max and the medium in Scott Foil, but the effective top tubes are near identical .  Focus 535mm in small, 551mm in medium. Scott 535mm in small, 550mm in medium.

The Scott even has a longer stem (110mm).

Can someone explain this. To me the effective top tube is how far you have to lean over to reach the bars.

 

Many thanks!!!

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