Being partial to Marina Militare dials, I say get the 339. The Destro in Titanium is amazing, and I had the opportunity to purchase one but went with a 217 instead. I couldn't be happier. I also have the 339----> MM dial, composite case, SE of 1500, 8 day, Giorni Brevettato.... A true future grail, IMO.
What's not to love?