They are different beasts :), and yes it's very important to understand both because they work in different ways. Most people that know of CoDel think it's a p

They are different beasts :), and yes it's very important to understand both because they work in different ways. Most people that know of CoDel think it's a panacea for buffer-bloat on their LAN but BBR is actually much more likely to be effective. The important distinction is that CoDel only prevents buffer-bloat on the hop where it's running. CoDel manipulates packet order in outgoing local buffers to signal the congestion control protocols at higher levels such as TCP that buffers are overflowing. The drawback of CoDel is that it only works if your router is the slowest link. If the bottleneck link is on your modem (most are), CoDel will only help if you artificially make your router the slowest link by limiting outgoing bandwidth to slightly lower than your modem upload speed. In practice most people don't know to do this. BBR in comparison reduces buffer-bloat along the entire path of the packet, but has its own disadvantages. First, it only works on TCP connections. Second, it helps the most if machines on both ends are using it. Each end of the TCP connection uses its own congestion control. Thirdly, it can only be applied at a machine level. If you put CoDel on your slowest link it will help all the traffic going through it, but only if the bottleneck is at that link. BBR will help prevent bufferbloat from end-to-end through all links a TCP connection flows, but only prevents TCP buffer-bloat completely on your router if every machine on the LAN is using it. Ideally you want to use both in every place you can.