In the world of diving watches, the Certina DS Super PH2000M STC and the Tissot Seastar 2000 44mm are two heavyweights that have captured the attention of watch enthusiasts. While both are serious divers from the Swatch Group, they couldn't be more different. The Certina DS Super PH2000M STC is a lightweight titanium retro-style diver that combines good looks with extreme specs, while the Tissot Seastar 2000 44mm is a more modern take on a diver, with a 44mm stainless steel case and a 600m depth rating. But which one would I choose for a serious diving expedition? Personally, I think the Certina DS Super PH2000M STC is the clear winner. What makes this particularly fascinating is that it strikes a perfect balance between specs and looks. The watch features a 43mm Grade 2 titanium case with a 16mm total thickness, a 50mm lug-to-lug, and a whopping 2,000m depth rating, making it ready for saturation diving. The turquoise gradient dial adds a modern playfulness that makes the watch far more interesting than its counterparts. The Certina also has a helium escape valve on its left flank, which is a great feature for divers. What many people don't realize is that the Certina DS Super PH2000M STC is not just a dive watch, but also a tool watch. The watch is super comfortable on the wrist, thanks to its lightweight titanium construction and five-row titanium bracelet. The Certina also has a detailed design with a knurled 12-sided bezel and a push-to-turn system, which adds to its functionality. In contrast, the Tissot Seastar 2000 44mm takes a more under-the-radar approach to its execution. While it has a jazzy colorway and a classic diver design, it lacks the detailed design and superior specs of the Certina. The Tissot also has a 44mm stainless steel case, which is larger than the Certina's 43mm case. If you take a step back and think about it, the Certina DS Super PH2000M STC is a more exciting and versatile watch than the Tissot Seastar 2000 44mm. It's a watch that can be worn daily, and it's also a great tool watch for divers. The Certina's detailed design, superior specs, and lightweight construction make it a no-brainer for me. In my opinion, the Certina DS Super PH2000M STC is one of the best dive watches under €2,000, and I would gladly pay the €400 premium for it. So, if you're looking for a serious dive watch, the Certina DS Super PH2000M STC is the watch for you.