How many are going? And when are you going? My brother and his tribe of 5 stayed at the FW Cabins, which we visited, and they're very nice, easily the best "rooms" of the resorts you've selected. CSR and CBR are the two most divisive moderates, and we're big fans of the CBR (Disclaimer: I've loved steel drums since before I even knew of Jimmy Buffet, and I'm a Parrothead - CBR's theming does loads for me, and my wife). Both resorts are going to be impacted by construction into 2019. Ironically, when fall arrives, the pool, playground and all of the Digsite area at CSR are going to be closed, just at the point when Centertown/Old Port Royale will be expected to open, with most construction winding down through what will be the new footprint of the CBR (with some Skyliner work continuing into 2019 that impacts the resort). The issue will be that the Riviera resort which occupies the old footprint of Barbados and half of Martinique, will still be underway, though most of the construction cranes will likely be down by that point.
If you're looking to spend time at the resort and some time at the pool or lounging on the beach, CBR is the best choice (the Digsite pool is good, one of the better ones at WDW, we like the CBR's pool better), especially if you're going this fall. FW is not known for having the best pools, although there's nothing wrong with them, indeed the Meadow Pool's corkscrew slide is nice; they just don't matchup to the rest of the pools at WDW, certainly what's available for the moderates and deluxes.
Best theming, CBR. Best pool, CBR. Best room, FW Cabins, complete with a kitchen.