My wife and I spent a week at Sunset House a few years ago. Then, we spent a week at Cobalt Coast. We've been back to Cobalt Coast for a total of seven trips. Here's why:
First, of course, is the accessible diving. Yes, both Sunset House and Cobalt Coast (Divetech) offer unlimited, 24 hour shore diving. But, Divetech offers two sites -- the house reef at Cobalt Coast and a mile down the iron shore at Lighthouse Point. I think Lighthouse Point is the best shore dive on the island. And, if you're a diving guest at Cobalt Coast, the transportation back and forth is free and readily available. For night diving, you can have dinner at Cobalt Coast, drop off the dock for a dive and come back for dessert.
The next thing we like about Cobalt Coast versus Sunset House is where you dive. Whenever possible, the boats at Cobalt Coast go to the north wall, which is well known for its dramatic reef architecture and opportunities to see larger fish and critters. You can't go there if you're diving with Sunset House.
We also like the accommodations at Cobalt Coast much better than the rooms at Sunset House. Cobalt Coast is like a European Inn -- only 20 rooms, and most of them are suites with a living area and separate bedroom and with huge European style bathtubs. The food at Cobalt Coast has a lot of variety -- from steaks to veggie to seafood to fish tacos to Indian. The daily specials and the chef's unique soups are hard to resist. (After our second visit to Cobalt Coast, we found we were eating all our meals at the hotel anyway and ever since we have opted for the generous meal plan. It's well worth it.)
Cobalt Coast also has one of the more entertaining bartenders on the island. It may not be a big bar with a lot of partying, like My Bar at Sunset House, but the quiet intimacy of Cobalt Coast's bar makes for great after-dive conversations with fellow divers and it's a nice way to wind down at the end of the day of diving.
One thing that is very unique to Cobalt Coast, which you won't find anywhere else on the island, is the level of hospitality and service provided by the owner, Arie, and the staff. I don't know of any other hotel where you are greeted when you step of the bus by the owner and the manager, Dora. Arie is always around, bussing tables at lunch, checking the coffee and the jams at breakfast (which just might include a jar of Dora's homemade mango jam). And, Arie always has a story and a moment to share it with you while you enjoy your lunch or dinner.
This service also extends to the Divetech staff. I very much like their unimposing style and their professionalism as well as their collective sense of humor. Christian has delivered some of the funniest, yet thorough dive briefings I've ever heard and watched. ("This is my favorite dive site. It's not where we actually are. It just happens to be my favorite and I enjoy drawing it.") It was because of the Divetech staff that I decided to spend a few days with them getting my AOW a few years ago. They are excellent teachers.
So, to boil down the comparisons between Cobalt Coast and Sunset House: If you want to party and do some diving, go to Sunset House. If you want to dive and have some nice meals and a night cap, go to Cobalt Coast. If you want to be close to George Town, go to Sunset House. If prefer a more quiet part of the island and don't care about shopping for T-shirts, go to Cobalt Coast.