Don't forget to include the nightly site fee to your costs if you choose to rent an RV. It is in addition to the cost of any rental you might choose. Depending on the time of year..you may be looking at close to $100.00 a night for the site fee. Add in the rental..and compare the cost to that of a cabin.
Be aware that the cabins can vary greatly in cost depending on the time of year as well. Cabins often run more than the cost of a room at the WL.
Although, you will have more space.
In any case, FW is a camping resort. Be aware that to reach the main themed pool area, you will likely have to take a bus,golf cart (great fun

but an additonal cost), bike or walk. Same for the Meadow or Settlement Trading Post areas. While the cabins offer you more room..they are not (in my opinion) especially convenient to the amenities of the campground. A golf cart rental is always a good option from cabin loops. Figure on another $50.00 a day for a golf cart rental..actually I believe it's more than that now...but you get the idea.