my vote is for Long seconds because rehaut "curve" is more obvious. But I like both versions actually.
I just miss steel bezel inlay, or even better - all steel bezel!!
And now my general opinion about this watch. When I saw first pictures few weeks ago I was thinking it will have classic crown position and normal crown guards, so it will looks like average diver with rolex case (like f.e. helberg ch7) and I was sure I will pass this time, because I am in love with kalmars. But... when I saw how the right "crown" side looks, with quite unusual crown position and quards, I am afraid it will be hard to resist to buy one. I think with this design it will be not such a best seller like many think! (I hope I am wrong)
I suppose most people (mostly non h2o customers) like to see an average and classy looking diver from h2o and people was expecting that Marlin will be such a watch, but it will be not because the crown position and crown guards! I can imagine many are disapointed with its design!
But many lovers like me, Danny etc will appreciate that h2o will release AGAIN somenthing unusual and very special! I am really surprised and happy, Clemens, because I was really thinking you are going to release true commercial model! (like every other rolexish diver).
So, IMHO Marlin looks amazing, its very innovative, combining classy curves with unusual and interesting design aspects. And also - it will be more comfortable not only because deep lugs, but better crown position.
Just still not sure which size to get... I am almost 7" wrist, but lately I prefer smaller watches (but sturdy) so maybe I will go for 40mm. I have f.e. 40mm Benarus Moray what is really a tank, despite its size! (and heavier than 8000m kalmar btw). I think you should change the 40mm size to 41mm, it should be still small enough but better for many... now the gap is too large (44 vs 40).
regarding movement - my vote is for 9015, only because the price is better, I like 2892 far more, but...