I like the Calibre 8 GMT (my favourite combination is exactly this, black dial and steel bracelet) for the complications (Soprod TT651 module for GMT time and grande date), the size (41 mm versus 39 mm), the fact that it has a sporty look but can be used even when wearing a suit; on the other hand, the calibre 6 chronometer has a red heuer logo on it... I would want to write more details, put links to the reviews, etc. etc. but at the moment the only thing in my mind is THE RED HEUER LOGO!!! Ok, I think I made my choice...