I ride on 700X23 and my last flat was about 4000 km ago in the rainy months when the street shoulders are not cleaned very often and all the grit accumulates there.
However, you HAVE to learn to fix a flat. It makes you more autonomous and much less vulnerable. As soon as you get your new bike (lucky you) practice in your garage. Go to an introductory mechanics class. Ask your bike mechanics at the shop where you buy it to show you how, talking you through the steps.
Most road bikes will take X23 and X25 without a problem anyway... (Although you might want to check if it's really important for you.) If you like the bike with X23 better but would like X25 tires, just ask the bike shop to change them.



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