The big distinction as I see it with CWA and CWP is with special assessments.
With CWA you actually are an owner of 60+ different resorts as is everybody else in CWA. What that means is if there is a special assessment for a resort the cost is spread out amongst everybody in CWA. With CWP you are an owner at one resort and any special assessment is paid by you.
So, a simple example. Bonnet Creek has a $2000 assessment for upgrades. And let's say there are 1000 CWA members, and CWA owns 10 weeks at BC.
So the total assessment to CWA would be $20,000, divided amongst 1000 members equals a cost of $20 each. Now if you owned a CWP week (or points) at BC you would pay the whole $2000.
There are other advantages and disadvantages to each system. There are no Hawaii resorts in CWA so no ARP there. There are CWA and CWP points at the same resorts. The difference in them is the amount you pay for maintenance fees. CWA is around $5.71/1000 CWP maintenance can be substantially higher OR lower depending on the resort. So if there is a particular place you want to go all the time, check what the maintenance is and buy accordingly. You like Panama City? Buy CWP. You like Sapphire Valley? Buy CWA.