Was mulling over the C#/Java situation & couldn't find a compelling reason to use C# other than for WhiteBox Testing. It is slaved to M$ OS & ecosystem, meaning that any hardware used as a test fixture is going to have 40G of bloatware & 1000 background services running which doesn't seem efficient or advisable when consistent results are paramount.
Jumping on the web & AutomationPanda.com seems to come to the same conclusion - though has a preference of Python, probably due to it being a little more lightweight. I just can't get with the syntax/format marriage. I'm not a fan of formatting being a part of syntax. I suppose it forces some standardization of coding styles, but who says that standard is the best approach.
Below, I rated each point for a few popular languages:
|Available Test Frameworks||awesome||awesome||awesome||good||okay||poor|
|Powerful Command Line||awesome||good||good||okay||poor||okay|
|Easy Build Integration||good||good||good||good||poor||poor|