Support says: "You can download a fairly simple I2P client called i2pd.  It's website is https://i2pd.website/.   We don't have anything to do with it's development, so do your own due diligence before installing it.  The original I2P client (Java-based) is available from https://geti2p.net/en/.   There are also other clients available, easily findable using any search engine."

So, calling all geeks who are familiar with I2P.

Is there a particular one recommended from your experience?  And Why?

What are the pros and cons of the ones commonly available?

Is anyone particularly recommended for use with Tixati?

I have used both Java I2P and I2Pd. I generally recommend Java I2P if you aren't sure. Java I2P is more user friendly and has more features in its webUI. I2Pd has a very minimal webUI and requires editing a config file. The main benefit of I2Pd is that it is written in C++ and has lower CPU/RAM usage than Java I2P.