I can provide you information on both PH and Aggressor since I have been on many of their trips. I have been diving for more that 25 years in most areas of the world and am both an TDI/SDI and NAUI instructor. The Peter Hughes boat you are speaking of belongs to Live/Dive Pacific headquartered in Kona. It is one of three boats and was an Aggressor boat that is being transplanted to Palau in July to be renamed the Tropic Dancer. Peter Hughes Diving and Aggressor are both owned by Wayne Brown although they are connected operationally. They are both good organizations and I would suggest you select one or the other based on the destination you desire. Peter Hughes has also moved the Wind Dancer to Cocos Island from Grenada. I do not dive in the Caribbean anymore. After more that twenty trips from Belize northward to the Bahamas and most destinations in between over the years I believe the Caribbean is very sick and that's very sad. I don't know for sure, but I suspect Aggressor and Peter Hughes Diving are doing the same. The bulk of my tropical diving is in the central and south Pacific. The life is more prolific, the water clear, and people are great. If you more info let me know.