Hola Nicolas, thank you so much for your advice!
Lateley I became a sort of IWC Pilot aficionado.
I will keep my 3717, and think of adding the 377709, (not the triple date but the classic one) as the sub dials are bigger than 3717.
Case is just 1 mm bigger, but with a bezel incorporated looks bigger tha 3717.
Anyway, i know they're quite similar but the small details are based the nature as collectors.