I have a year old Sinn UX GSG watch and saw an offer for a 2017 Grand Seiko Quartz Diver for a few hundred dollars more. I love the Sinn, but it is a bit heavy and definitely a problem sending it to Germany every 7 years for an expensive battery change. The Seiko requires battery changes every 3 years, though and doesn't have extra hardened steel like the Sinn. Which mechanism would likely hold up longer: a GS 9F or a ETA 955.652? Which company honors its warranties more? Is there any difference in accuracy as actually measured (as opposed to advertized numbers)? I would consider a more modern Citizen Chronomaster or Grand Seiko - but neither make sports watches with significant lume, and that is important. Which is a better watch (leaving out prestige)?