I spent a week on the Rock Island Aggressor in May 2019. The elevator on the stern for their dive skiff works great. There are a lot of places you can't get close enough to on a liveaboard so they have a large skiff they raise out of the water to deck level. Your gear stays on the skiff, you board in your wetsuit, and take your camera gear if you have it. Food was better than what I had during two weeks I spent onshore. We were lucky in that we only had a half load of passengers so everyone had a cabin to themselves and the skiff wasn't crowded at all. There are plenty of videos on YouTube that shows it.
They were only running one of the two Aggressor boats at a time when I was there due to limited passenger loads but they are sister ships so it doesn't matter which one you get. I dove with Fish 'n Fins the rest of the time using basically the same skiffs as on the Aggressors. I also took some tours of the islands with Fish 'n Fins, which is interesting if you are interested in history in general and the Japanese occupation in particular. I went with a neighbor who grew up there as a kid because his father was in charge of facilities on the island after WWII.
As for maximizing diving, liveaboards are the best option. I especially enjoyed dives off Orange Beach on Pelalu. One of my uncles was a Marine and died there (before I was born). There is a decent variety of restaurants onshore and the locals are very nice. The day boat runs can be pretty long for the better locations. For a solo traveler, the cost was about the same for a hotel, meals, and day boats as the Aggressor. It is nice to spend a day or two in a hotel on either side of a liveaboard if you can spare the time and money.
As with any liveaboard, bring your Nitrox card and a spare decompression computer. One guy lost a day of diving when his died. The Aggressor boats let us borrow a Nautilus VHF radio beacon. There is a LOT of current diving so having a Nautilus or a PLB is advisable in case you get swept away. A reef hook is also a virtual necessity. When I went, the Aggressor Web site stated that DIN valves weren't available on these boats. Not true, they were all convertible pro valves.