Ok both are 36mm variants. As a former mountain climber, I have to go with the Explorer. Now, if I were to get an OP I am not complaining. I had a Casio Pathfinder on my wrist as I climbed several mountains.
I have a solar Casio (15 years old) Seiko (5months) and a Garmin instinct2 (1year). I would like to get a GShock GW-M5610U-1JF to compare to the 15year old still going strong. I have plenty of mechanical and quartz watches. Solar is a great bonus.
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