SimpleX is transport agnostic - it can work over standard web protocols, e.g. P2P implementations can be blocked by some Internet providers (like BitTorrent). SimpleX uses out-of-band messages or, in some cases, pre-existing secure and trusted connections for the initial key exchange. P2P does not solve MITM attack problem, and most existing implementations do not use out-of-band messages for the initial key exchange. SimpleX design, unlike most P2P networks, has no global user identifiers of any kind, even temporary, and only uses temporary pairwise identifiers, providing better anonymity and metadata protection. In P2P networks the message is passed through O(log N) nodes sequentially, using nodes chosen by the algorithm.
SimpleX has both better delivery guarantee and lower latency than P2P, because the message can be redundantly passed via several servers in parallel, using the servers chosen by the recipient.
DHT designs have to balance delivery guarantee and latency. P2P networks rely on some variant of DHT to route messages. P2P messaging protocols and apps have various problems that make them less reliable than SimpleX, more complex to analyse, and vulnerable to several types of attack.
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