There are many dives shops here on the island, and pretty much most are them are solid and try to do their best for giving their services to divers. As for those mentioned on the lists, Aruba bob snorkel and scuba, based in Savaneta, personally they are some of the friendliest guys I know, their dive shop is not the biggest operation, what sets them apart is the people working there as the instructors there are really interactive in teaching open water. Making It a very great and fun experience for tourist receiving the open water cert. They do partner up with 2 different dive shops, as they use their dive boats for their boat dive, I'm sure one is Aruba watersports center's boat and the other I believe to be Nautilus dive center's boat, although I can not confirm, that boat's name in question is called Seatoy. Aruba water sports center has a bigger operation, offering more than just diving, they have a pretty spacious and nice dive boat, although a bit slow it provides great coverage against sun protection, The captain is also a pretty cool guy, also very interactive gives I would say the same support and interactiveness. I don't have much experience with Nautilus and mermaid dive shops, other than I believe they offer good experiences for diving.(don't quote me, should check review sites) Nautilus Is based in Pos Chikito to Mangel Halto district and mermaid is in Noord/Palm Beach area. I have been on the Palm Beach diver's boat, very fast and somewhat luxurious boat, I Have only been on the Palm Beach diver and Aruba watersports center's boat because of a coral research and restoration project I've been a part of months ago. Furthermore, I believe all of these are Padi Dive centers and from what I know they are recommended for open water and advanced open. Hard to give you a rundown on the best dive centers in Aruba, as I do not normally do (FUN) dives on boats. You do have the Top dogs and then the underdogs here on Aruba.