which one do you prefer? python with C# or java?

[Yesterday Paid]

I'm planning to learn one more language with my python.
Someone recommended to do Lisp or Clojure, but I don't think it's a
good idea(do you?)
So, I consider C# with ironpython or Java with Jython.
It's a hard choice...I like Visual studio(because my first lang is VB6
so I'm familiar with that)
but maybe java would be more useful out of windows.

what do you think?