As noted, this is a complicated question at this stage of your investigation. First, you need sufficient timeshare and Disney experience to make an informed decision though you have to start somewhere. I get a sense you don't have a lot of experience staying on property with Disney from your post. DVC makes sense if staying on property is important (and one is willing to pay more to do so), used ONLY for DVC rooms, $$$ wise for resale and one can afford it (to me that's pay cash). One also needs to be OK with the long term commitment and the compromises of a timeshare. Off property timeshares will be the cheapest options, renting DVC privately will be the cheapest option other than buying. Simplistically speaking, DVC will be more expensive than value rooms and roughly the same as moderates but with added value and benefits.
You need to investigate this sufficiently. IMO it takes around 6 months of active investigation to be sufficiently educated. I generally recommend at least one private rental to check it out before buying. You should look at resale, quite a bit cheaper but with some limitations. It's roughly 60-80% of the retail price depending on choices.