Hi CL fans!
I really need your help!

I am torn between Poly CL TPV and CR Atrium Magic Kingdom view.
We've done both. All resort have pros and cons. If your top priority is convenience getting around, go CR. If your top priority is fun theming, pick Poly.
Another easy way to make a decision is to think about your ADR choices. Eating at your home resort is always easy. Though with CL some food my be redundant. Like CR CL desserts will be similar to Chef Mickey's buffet.
However, and this might be a slight tipping point- we pick standard view at CR. MK view is a waste of $, IMO. If you are staying MK view- you only get one view. If you pick standard view, you get the benefit of two different views.
At Poly, there is some advantage to getting the them park view in your room. Again though, if you want the best view of the theme park, the lounge is the place to see it. The Poly lounge has very large plate glass windows, food, staff. There's also construction at Poly. I am thinking it is almost done now, but I don't know when the official opening is.
Not sure what you mean about hustle and bustle. At CR our rooms were very quiet, at least on CR level. Coming and going in the elevators can be busy, but the actual CL floor is pretty quiet and relaxing.
Poly was one of the very few CL rooms where we could hear our neighbors- at any CL room. I think the kids we heard were just especially loud! To me, I also find the Poly rooms very dark. Everything is brown, and heavy looking. The pool though is tons of fun!
Maybe the pool has been revised, not sure- but when we stayed oly does not have a hot tub. I don't know if that matters.
At Cr, transportation convenience isn't just being able to walk to MK. It's wider access. You can go to any resort from the MK bus stop, and back (as late as MK is open). Poly is next door to TTC, so Epcot monorail is a breeze.
All lounges can be variable in terms of crowd levels. All WDW eateries have a morning rush hour, and 5-6pm rush hour. Outside those hours, you'll get a quieter experience.