Strange that noone mentioned Garmin. You can get Descent G2 for 600EUR which has the screen of the significantly more expensive Descent MK3i 43mm and it doubles as your daily smart and sports watch. Battery life is more than a week in smartwatch mode. You need to charge once on a full dive week. Custom gradient factors, clean Buhlmann 16 algorithm. It's a fantastic device, compass works great. Sapphire glass, plastic case gets a lot of beating without a scratch, just like the previous G1. No deco lockouts or any other crap, it always worked for me.
Con: It doesn't support Air Integration, but I realized I don't need it. Had the MK3i + the transmitter and only found out after 40-50 dives that I was paying too much attention that someone doesn't bang my gear at the transmitter on zodiacs and trucks, even though it was on extension hose. Plus it was adding weight to the overall regulator pack.
If you like the premium feel, materials and need the AI, have a look at the Descent MK3i versions. Both are awesome. The bigger one has unmatched battery life, but I find it too massive for daily use. 43mm MK3i lasts a week on a charge as well as the G2.
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Option 2 for me is the Shearwater Perdix 2 (user replaceable battery and proven device). Unlike the smartwatch Shearwater, that I consider a bit of on the risky side, Perdix is also super reliable. I just don't like the idea of having an electronic device just for diving, which is essentially another box to carry. But it's very good.