After just having stayed at the Poly at the beginning of September I can be the voice of experience for you. It was ok walking around the Poly trying to get from here to there but I definitely would trade the the external walkways of the Poly for the air conditioned, indoor "ambiance" of the BC/YC. That however is subjective as is this entire post. Having a permanent Dole Whip station at the Poly was a plus as opposed to the "Now you see it, oops we decided not to staff it" Dole whip station at the BC.
Interestingly enough I found Captain Cooks to be just as limited as the BC marketplace. I suppose one could chalk that up to a menu preference though.
Menu for Capt. Cooks:
BREAKFAST: http://allears.net/dining/menu/capt-cooks/breakfast
Lunch/din, din:
http://allears.net/dining/menu/capt-cooks/lunch-dinner
Kona Island Sushi fiesta: Lunch,dinner:
http://allears.net/dining/menu/kona-island/dinner
Beach Club Marketplace: Breakfast:
http://allears.net/dining/menu/beach-club-marketplace/breakfast
Dinner:
http://allears.net/dining/menu/beach-club-marketplace/lunch-dinner
Hurricane Hannah's: Lunch
http://allears.net/dining/menu/hurricane-hannas/all-day
As far as transportation is concerned we used the boats and the Monorail at the Poly but there is something to be said for having two theme parks within walking distance out your backdoor like at the Beach Club.
Now we get to the thing about the Poly that really bummed me out. It was the pool. It was so small and so crowded. There was no space in the pool where you couldn't reach out and miss whacking someone with your pool noodle. People were on top of you, kids were on top of you. Entire families would charge past in in a panic trying to avoid small children in swim diapers. There was simply no place to go. The hot tub had one of those ticket machines that you see in the cold cuts line at your local supermarket. Well maybe I'm kidding about that but it was really crowded.
I know we like to bust on the lack of availability of chairs at Stormalong Bay but there were definitely not a lot of chairs available on the way smaller pool deck of the Poly. I really enjoyed going from chair to chair begging the beached resort guests for an open one. After 100 tries I was almost out of chairs before I finally snagged one from a sympathetic table dweller.
I didn't dare go down the slide at the Poly because there were no lockers to stash my phone in. The Beach Club has lockers located in the pool area. There was a shower in the ladies room of the Poly pool but it was in disrepair and it lacked a private changing area unless you were in the shower stall. This was an upgrade over the completely outdoor shower stations at the Beach Club, but then again Ninja Mom has no shame and she would not be adverse to showering "Au Natural" to teach BC/YC management a lesson about proper locker room facilities at a deluxe resort.
So there you have my two cents on one person's comparison of the Poly versus the Beach Club. If the pool is a part of your vacation experience then stay clear of the Poly pool, even if your child is still rocking the swim diapers, because they have plenty of them over at the Poly Pool
~NM