Hmmm. On my last Cocos trip, it was bright and sunny our entire week on the island, not seeing any rain until the trip back to the mainland. That was in the month of July, smack dab in the middle of the "wet season".I see that I started a thread that many people have preferences either way. I do appreciate all of your input, I'll be pushing for Galapagos when the time comes if the price is within reach, otherwise Cocos will be the trip of choice. I also like the idea that Galapagos has a bit more sunshine than your average Cocos Island trip. Alot has to happen before a final decision can be made, but again, I do possess alot more info than I previously had so thank you all very much.
OTOH, on my last Galapagos trip, which was in the middle of August, the "garua" weather kept the skies overcast most of the trip, finally turning into strong rain at the end. Combined with cold waters (currents and upwellings) and a strong breeze, we were freezing our butts off unsuiting after a dive, huddling together like penguins for warmth in the few wind-sheltered areas of the dive deck, gulping hot tea, and almost coming to blows fighting over the two warm deck showers.
While there are many factors differentiating the two locations, weather being one of them, you probably don't want to count on sun in either of them and if you luck out, great. A lot of people don't like Galapagos because the water is too cold. A lot of people don't like Cocos because the crossing is too long. A lot of people like Galapagos or don't like Galapagos because of the land tours and fewer dive opportunities, whereas a Cocos trip is a more typical liveaboard "dive eat sleep" schedule offering 4 dives a day plus night dives. I'd give those factors more weight than the chance of sun.