| **Scalability** | Whisper doesn't scale very well, specifically when it comes to bandwidth usage on mobile devices. | Uses gossipsub and content topics. |
| **Spam Resistance** | Proof of work requires too much battery and compute power making it a poor mechanism for heterogeneous nodes. | Uses innovative p2p economic spam protection mechanism RLN Relay |
| **No incentivized infrastructure** | There is no incentive to run a Whisper node | Research in progress to design incentivization for node operators. |
| **Formal Specification/Documentation** | Lack of formal and unambiguous specification | Open source specs & docs and available for anyone to read or improve. |
| **Portability** | Runs over devp2p which limits where Whisper can run and how | Waku is built using libp2p, making it easy to run Waku anywhere. |