If I may add to footnote 4, i2p outproxies are also statically defined in your configuration, vs tor which has automatically dynamic exit nodes. The typical advice if you're going to host an outproxy is to bridge it into tor to maintain anonymity.

Plus, a neat effect of bridging i2p into tor is you can use both eepsites and onion sites, as well as anonymous browsing the clearweb from the same browser without having to swap proxy configurations. Of course this comes with its own cautions.