I forgot the most important

• Scales because users can pay the routers. Tor network has stagnated at 6000 nodes for almost a decade.

• Pure source routing, no latency negotiating onion layers, all done via session purchase.
• Because of source routing, there can be embedded onions inside packets that follow arbitrary paths back to the sender, like traceroute for tcp/ip, meaning there can be strong latency minimisation guarantees and long living connections, two things that are painful with Tor's telescoping model.