These two watches aren't really comparable. For starters, the Citizen is a quartz, while the Seiko's an auto. But the bigger picture is that the JP2000 is a much more serious specialized piece packed with features only a diver would use such as:
Underwater Depth Display Down to 260 Feet - 80 m.
Depth Memory for Last Dive.
Auto Dive Time Memory for Last Dive. Dive Time Alarm (5-60 min).
Dive Meter - Tell depth (3 FT - 268 FT).
Dive time alarm.
Maximum depth indicator.
Rapid ascent warning.
So it's all a matter of what you plan to use the watch for. If you're a regular diver, then the Citizen is the obvious choice. For casual use, go for the 007 which is a classic, timeless piece.
It depends. If it is going to be a primary diving watch, used frequently, the Citizen.
If it is going to be used daily watch, the Seiko is more flexible to wear (from jeans to wet suit). Its use is more flexible if you get a diving computer and use it as a backup. That is, more watches!
Take the Seiko - since for diving you have a dive computer anyway, right? That the Seiko is an Automatic is for me a plus as well. Design wise it looks on my opinion clearer and therfore it is an every-day-watch as well!
The Seiko for me. Why? Because I've never liked the styling of those Citizen's. I want them to come out with something that actually looks good with the same features...There is the 20th anniversary one, but it's a completely different watch. Something similar would be cool. The buttons on the Citizen look like something of an old Casio. The Seiko is awesome. (this is coming from a person that dives.)
Either way, despite my dislike, they really are nice watches. Seen the Citizen in person and it's built really nicely, IMHO.
It's a toss up for me - I have a 007 and it is absolutely classic, and I prefer autos over quartz - but, there is something cool about the toolish utility of the Citizen - you should get both, of course.
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