I have been to Revillagigedos 3 times and in my opinion March is the best time to go. During my two trips in March I swam with whales 4 times and saw them multiple times passing close to the boat. The giant manta rays are extremely friendly, on a few occasions I had to duck my head so that the manta did not make contact with me. My last trip in Jan we saw dolphins on almost every dive including a huge pod of 20+ members at Roca Partida. In terms of sharks I saw silkies, Galapagos, silver tip, white tip, and hammer heads... still waiting for my tiger shark encounter. Apparently there is an 18 foot tiger shark that occasionally makes an appearance.
For me Revillagigedos (Socorro) is “the” location for actual encounters with animals not just passing glimpses.
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