Sandals St Lucia or Antigua?

My future wife and I are planning our honeymmon for AUG 2012. We have narrowed our choices to either Sandals Grande St Lucian or Sandals Antigua. We are having a tough time decided which one is the correct fit. There are so many pros for both. Ive seen video of both and it appears that the beach in Antigua is a bit nice with the blue water, that is important for her. However, the stay at one play at 3 option of St Lucia really appeals to me. I seem to get a bit restless and enjoy walking around a large resort. Has anyone been to both resorts and can point out the major differences and pros and cons of both. Thanks