Hey Ron,
I'm in Quito now having just finished a week out in the Galapagos. Conditions continue to be great. We dove darwin 8 times over 2 days. We saw whale sharks on all dives except for 2. Of the 6 dives where we saw whale sharks, every dive had multiple whale shark encounters - generally between 2-4 whale sharks per dive. I was able to get good ID shots of several whale sharks and submitted those to whaleshark.org. Three whale sharks were new to their database and given the names G-046, G-047, G-048 respectively.
Hammerheads on every dive throughout the week (except for our check out dive), frequent galapagos shark sightings. Wolf was teeming with galapagos sharks with many seen on dives there. Sporadic manta sightings throughout the week, although i didn't get any close encounters with one. Occassional dolphins, frequent turtles.
Did not personally encounter any silky sharks although our DM claims he saw a few at wolf (i think he may have been confusing them with small galapagos sharks). Saw only one black-tip reef shark and that was from the boat. We had a small bait ball under our boat on the day of departure with bonito hitting very small bait fish from below and pelicans from above.
Sadly, a diver died on the peter hughes boat the day we arrived at darwin. I wasn't able to get any details on that incident though (I was on the explorer ventures boat).
I dove a 7mm with 3mm gloves and 5mm booties and was fine for all of the northern diving. I added a 5/3 hood for the southern dives and was never cold.
All in all, a great week of diving. Shot lots of video and had a good time.
In regards to comparing cocos to galapagos, they are similar in a lot of ways. definitely more galapagos sharks and whale sharks in galapagos, saw more dolphin/tuna/black-tips/white-tips/silkys in cocos. Of course, i'm basing this off of my limited personal experience, so take it with a grain of salt. Cocos is warmer diving, generally 5mm with gloves and full-foot fins with hotsocks was perfect for me. Galapagos was a bit colder but not too bad and as I said above I was comfortable in my 7mm.
One limiting factor of my week long liveaboard to galapagos was that it only allowed for 3 days of diving up at darwin/wolf. that's the best diving there, imho. while on the other hand, cocos takes a day of traveling to get to, we were able to dive a lot more days on cocos once there as there was a lot less moving from site to site.
I think both are fantastic sites, both are personal favorites and I hope to return to both. If you want to see big whale sharks, I imagine darwin is as sure of a bet as there is anywhere in the world.
video to follow...