In the particular case discussed here hydrogen just wins hands down. You can easily generate hydrogen at sea, but you can't bring a floating chemical plant to make other fuels. The alternative to send electricity via cable was also considered:

  > For offshore wind producers, meanwhile, Lhyfe projects that adding electrolysis and a hydrogen pipeline to shore will reduce the cost of delivering their energy as wind parks move further offshore. “A hydrogen production plant plus pipeline is five to ten times cheaper, as an investment, than an electric substation plus a cable,” says Le Berre.