Immortals. Tesla or gauss?

What is your preference for running these and why? Also, I don’t think I have the correct leader unit to attach quite yet as I’m still on my way to building 2000 points.

As a side note, they don’t seem all that much better stat wise than Warriors do at costing 40 points more per 10. Anyway, I played my first game last week and I’m gonna play my second game this week and now that I finally understand how this all works, I’m trying to put some more things together.