Hi Happy and welcome to the OF!
Not long ago, I asked myself the same questions, also having a 7" wrist. Since I don't buy a new watch too often, I decided to make a list of priorities first, and look for the best match to my own needs later. So the first and most relevant question is: "what do I exactly need the watch for?" At first, it sounds obvious: to tell the time. But at a closer look we all have different life histories that result in different priorities.
As an example, my order of priorities are:
1. reliable accuracy
2. date function
3. reliable impermeability
4. readability of the display
5. lume
6. availability
7. rotating bezel
8. wearing comfort
After beeing clear about this, I started trying different versions on. In the place I work, there is an Omega Boutique with all current versions available. In my theory, I was leaning towards the 39.5 mm one, but after trying all possible candidates again and again, I found the 39.5 much less readable than the 43.5, and also the 43.5 was, to my surprise, MUCH smaller and more confortable than I expected. Since a reliable accuracy is prio 1 for me, I discarted the 42 mm, and since readability is a higher prio than comfort, there was only one wright choice left: 43.5mm.
So, on the same way I encourage you to take your time to do this cerebral work first, and then the answer should result really easy and long lasting satisfactory.
What is your list of priorities?
I hope it helps a little bit to make your hunt more satisfactory.
Happy hunt, Happy.
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