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Aesthetics aside, the dropped seatstay and seatpost clamp below the top tube on the #3 SS means that there is at least 6cm more seatpost and probably at least 8cm above the clamp on the #3 SS compared with the #1 SS (perspective in the photo doesn't really show the difference that well). The #3 is noticeably more comfortable than the #1 without loss of apparent stiffness, so I'm happy with the change in geometry.
Relevant
https://www.youtube.com/watch?v=1_zPYkk_Fsk