RIBs and roll-up inflatables are two different types of inflatable boats. Here are some differences between them:

RIB: RIB stands for Rigid Inflatable Boat, which means that the boat has a hard hull construction of aluminum, composite or other materials along with an inflatable tube. This gives the boat a high capacity and stability, but it makes it heavier and more complicated to transport.

Roll up inflatables: Roll up inflatables are inflatable rubber boats that can be rolled up when not in use. This makes them light and easy to transport, but they may have lower capacity and stability than RIBs. For those who need to pack their dinghy in a bag. The dinghy has a soft bottom made of rubber boat material that allows you to roll it up and store it away or transport it easily. If you do this often, you may want to add an electric pump.
The inflatable dinghy is the most popular dinghy to have on board a larger boat.

There are advantages and disadvantages to both types of inflatable rubber boats, so it is important to think about what you plan to use the boat for before making your purchase.