Thank you for the thoughtful answer. It covers most of the things I was inquiring about.
First, I got to take a look at S class ships (Solstice, and "Solstice" was the first, so that's how they kick off a new genre within their fleet) and do see that they positioned quite a bit of glass up above, and above the bridge in general. That means more great views. S ships come in at about 122,000 tons and M ships come in at around 90,000 tons.
It's great to know about the dining situation and the dress code. For Cunard, I only brought one suit with several shirts and ties. There are minimum of 2 gala nights on a TA crossing, and a dark suit and tie is the basic admission fee, so to speak. I also brought along several slacks and collared buttoned shirts. This sounds even better for me, though I will probably still bring one suit.
You mentioned the things I like - presentations, shows, games, quizzes, but I'm guessing no movies. I also like a fitness center, which they all have, and just sitting by the pool or in the hot tub. And just relaxing watching the sea go by.
I would agree that Cunard is now as North American as it is British. That holds for QM2, which, on some days, felt like an extension of NYC at sea! From the one experience on QE2, I'd say that felt more British, but that was a few decades before sailing on QM2.
I'm wondering if the more southerly route across the North Atlantic during a TA offers benefits like a smoother ride.