Browsing is way faster than tor and I encounter less captchas.

You just need to run your node for some time at the beginning for discovery reasons.

But I only use I2P to visit one specific eepsite. So don't know how the rest of the network behaves.

If you run both Tor and I2P at the same time, it's harder to do eclipse attacks against you.

Also, addnode= with your friends or other parties you trust, can be useful.