Hi. I have 5 contracts at Poly, 1 at BLT and 2 at AKL. They all have their good points.
AKL is my favorite. To me, it is a magical place, as well as a unique hotel in the whole world. Nothing else is like it with its strong African theming and the 'Savannahs' right outside the hotel. There is NOTHING like sitting out on your balcony, or in the outdoor observation area and just relaxing while you watch the Savannah. I love the restaurants there. They are African/Indian/American fusion, for the most part, and I find the food at them to be consistently good to amazing. I think the staff is among the friendliest in Disney World, and I personally believe travel times are much better than SSR, OKW, Poly, and VGF, as well as faster than anywhere from BLT, except walking to Magic Kingdom from BLT. I feel AKL (either Jambo or Kidani, it matters not at all which one your deed is in) is the best mix of price, luxury, length of contract and overall value. Cost has been around $105 to $115 per point. Expires in 38 years.
BLT is second for me. California Grill is expensive, but truly one of the best restaurants in DW. View of the fireworks from California Grill, California Grill Lounge and Top of the World Lounge can't be beat. It is sometimes hard to get into California Grill, but I have found that, really, if you show up and have them put you on their waitlist, you can almost always get in. And if you can't, you can always ask to 'wait' in the California Grill Lounge, where you can order food, OR you can order ALL the menu items off the California Grill menu. The tables are small 'drink' tables, rather than Dinner tables, but that is okay. BLT has the best and fastest access to the Magic Kingdom, because you can walk, and it also is on the monorail. The monorail is such an icon, and it is so cool to see it go right through the Contemporary. The rooms at BLT are typical 'Modern' style, but that is okay. Best of all, I love the view out over Bay Lake and Seven Seas Lagoon. Amazing. Just sit out there on your balcony and watch the sunrise or the sunset. BLT is an excellent value, cost wise it tends to run around $130 to $145 a point, and the contracts last longer. Expires in about 41 years.
Poly is one of the 'original' Disney World resorts, and is iconic in its own right. On the monorail, close to the ferry and the Ticket and Transportation Center. I'm not as impressed as some with the landscaping and decor. I don't think they are Polynesian enough, but maybe that is just me. The rooms are all converted hotel rooms, and they pretty much look like it. Not bad, but nothing particularly special. Most of the rooms ARE set up to be adjoining, if desired. There is less variety of room types than all the other resorts. Your only choices are Standard View Studios, Lake View Studios, and then the hellishly expensive Bungalows which even I will probably never stay in, despite the fact that I have a ton of points. Overall, I rate Poly as number 3 on this list, though I know a lot of people will disagree. I still think maybe I was expecting much more 'Polynesian,' after I had been spoiled for Africa by Animal Kingdom Lodges. It is nice to be on the monorail, but don't make the mistake of thinking the monorail is particularly fast. It isn't bad to the Magic Kingdom, but it takes an unexpectedly large amount of time to get to Epcot. Buses at Poly are usually also shared with Grand Floridian, so you will be stopping there on most bus trips. I absolutely do NOT like Captain Cook's (the quick service restaurant). I found their food to be unbalanced and strangely seasoned. It was like they were reaching too far, and falling flat on their face. On the other hand, I love Kona Cafe and could eat Breakfast, Lunch and Dinner there anytime. For breakfast you can usually show up and ask to go on their wait list and generally get seated pretty quickly. Ohana has some pretty good stuff, but maybe too much. A surprisingly good food choice is to order Ohana for two, to your room. They bring enough food for four people, easily, and it is the same meat skewers and asian side dishes. For buildings, I like Tokelau, and prefer the 3rd floor, if possible. It is more central than Moorea and Pago Pago, though those two are closer to the Ticket and Transportation Center. You can watch the fireworks from the beach at Poly, and another great place is from the Deck, just off the stairway, on the 3rd floor of Tokelau, North End. It is close enough to the beach to hear the music for the Fireworks. Poly is still an excellent value, and if you like it, go for it. Cost is typically running about $140 to $165 per point for contracts (I'd keep looking for good contracts on the lower end). And it expires in 47 years. So you pay a bit more, but get it back through longer use.
I know I didn't really tell you which one to buy, but I wanted to kind of give you a feel for them. I guess you will need to evaluate the price and contract length in light of whatever types of stuff you like. But, really, as long as you are going in with your eyes open, I don't think you will go wrong with any of them.