Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.

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If you want to accurately track HR, get a watch that can sync with a chest strap HR monitor. I have the Garmin Tactics Charlie and the chest strapnHR Pro which is waterproof so you can swim with it. It's probably too bulky for you, but check battery life. I charge my watch once every 3-3 weeks.
I3 tactical for field work/deployment, Tactix for leave.
I spent good money on the tactix. It's great. I've beaten and abused it. It's a tank. Does all the smartphone nonsense and way way more. Lasts about 20~ days on a charge so I can actually get all the telemetry back when I sleep and it's useful.
I have both, ultra 4 and tactix. Love them like children so hard to pick one but when it comes to HR accuracy and health tracking nothing comes close to Apple Watch. Get Bevel app if you haven’t yet that way you will get everything you missed about Garmin with much better accuracy
Ok, just hear me out for one second before you think I'm crazy. The red light on the Fenix line is AMAZING. I use it every single night multiple times as it makes walking around at night super easy and not at all straining on the eyes. Honestly, it might be my "I'm not giving up this watch for e.g. an Apple watch, ever" feature. The Tactix light is green. I have no idea how well that'll work at night. But I absolutely LOVE the red light.
You’ve said that cost isn’t a problem, and you like the look of the Tactix, I would suggest getting it. To address your questions: Round form factor, yes. Watch faces, yes. Battery life, yes. (Especially on the bigger diameter watches) You can customise the information you want to see on the watch faces, it just has to be a face that has enough slots to accommodate the quantity of items you want. Timer, there is one built in. It looks like there are others in the ConnectIQ app that you can load onto your watch also. Text notifications, yes. There is a sleep mode that includes DND so notifications are silenced.
OP has said he likes the look of the Tactix and is happy to throw money at it. If he said he wanted to be frugal about it, I would have suggested a different watch.
Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.

Garmin
Forerunner 955 Series
Best value, clear MIP screen; limited smartwatch features.

Garmin
Fenix 7 Series
Durable, multi-week battery, flashlight; high price, buggy software.
Garmin
Instinct 2 Series
Rugged, solar multi-week battery; bulky, small screen readability issues.

Garmin
Enduro 3
Multi-week solar battery, lightweight; but bulky form factor.

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Oura - Oura Ring Series

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Apple - Ultra Series

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Garmin - Enduro 3

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Garmin - Fenix 7 Series

Ranked #1
Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series