Seiko all the way in my opinion.
I wear mine with a grey NATO strap and it's one tough mother.
The Tissot has chrono pushers which require screw down to be fully resistant to 200m and if you forget... buh-bye... plus in my opinion, does not have the hands down reputation of a Seiko OM for reliability.
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Lee
This is my watch. There are many like it but this one is mine...
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