RAQ was the first cryptocurrency to go live with Dandelion++ on mainnet. Most other cryptocurrencies use a gossip model whereby when they receive a transaction, they tell all other nodes connected to it about the transaction. As a result the transaction propagates quickly through the network. The downside is that an adversary who can monitor the network can see this chain reaction happening and can approximate with a high degree of accuracy which node the transaction originated from.
Dandelion++ obfuscates these type of analysis by changing the way the transactions are broadcasted by randomly choosing to tell one other node about the transaction or to switch to gossip mode. This makes it harder to associate a node with a particular transaction.
RAQ also fully supports the use of the Tor network that can work alongside with Dandelion++.
RAQ is intending to move to a mixnet model in the future.