FTW cabins are about 504 sg ft, have one small bedroom with a double and bunks, and a pull-out couch in the also small living room, and a little kitchen, and it has one small bathroom. Many years ago, I actually stayed in those a few times.
If you have six with
DVC, you need to get a 2BR because the maximum in studios and 1BRs range from 4 to 5 depending on resort. The 1BRs themselves are more than 200 to 500 sq ft larger than a cabin, depending on resort. The two bedrooms are more than 500 to 900 sq ft larger than the cabins. You mention OKW as the possible choice, its 1BRs are just over 1,000 sq ft and 2BRs 1400 (i.e., almost 3X larger than that cabin) The one and two bedrooms all have large kitchens, washer/dryers, large master bedrooms, large master bathrooms, and 1BRs at Kidani and Bay Lake Tower have a second bathroom. The 2BRs add another large room that has its own bathroom and two beds, either two queens or a queen and a pull-out couch or Murphy bed that pulls down from the wall over a couch. Comparing the FTW rooms to a 1BR or 2BR DVC room is really like comparing a walk-in closet to a house. Since it sounds like have done a FTW cabin, you should likely go to
YouTube and do a search for walk-throughs of the DVC 1BRs or 2BRs to get a sense of the difference, e.g., you can find such walk-throughs for any DVC resort by simply searching for "two bedroom " or "one bedroom" and name the particular DVC Resort after those words, e.g., "two bedroom Old Key West"
Transportation to parks from a DVC resort depends on the resort but all have quicker applicable trips to a park than FTW. FTW has an internal bus that makes multiple stops that takes you to a place to get the transportation to the park -- a boat for MK and bus for others and thus you have the issue of two different waiting times for the transportation to a park. With DVC resorts, the transportation device you get on after leaving your room is the one that goes to a park (e.g., a bus, a monorail, a boat, or the Skyliner, and for some you can just walk to a park (to EPCOT or Studios from BWV or BCV, to Magic Kingdom from BLT or VGF).
FTW is very good for on-site amenities when all are working (not subject to covid closures or limitations). I have always considered its buffet restaurant, Trail' End, to be one of the best. It provides quick access to Hoop-Dee-Doo, you can do wagon rides and horseback rides, and pony rides for kids, there is an evening campfire (with movie), stores are good, good pools, you can rent boats, and you can even rent a golf cart for internal transportation. DVC Resorts also have good amenities and they vary among the resorts, and those at some of the DVC Resorts may be considered better than those offered at FTW, but If amenities were the only issue, choosing the less expensive FTW would likely be the choice.
(As corrected following Zavandor's post below) FTW will, come Oct, be limited to early entry extra hours while all the DVC resorts will have both nightly and early entry extra hours. (That Disney decision to deprive the moderates and values of nightly extra hours is, in my personal view, an extremely callous and bad decision.)
FTW is significantly less costly than what you need for six at a DVC Resort, a 2BR, even if your are renting points, which itself is significantly less costly than what Disney charges for DVC Resorts to the general public.