I've had 50/50. These days I'm fairly okay with just taking the Macbook Pro. I did have one instance where I got one my first week and used my Dell XPS with Linux the entire 10 months I was at the place. I returned the Macbook basically unused.
Only one time did I interview with a place where I asked if I'd be given a choice what hardware/OS I could use. The response was "We use Windows". My response was, "no we do not. Either I will not be using Windows with you, or I will not be using Windows NOT with you". I didn't get an offer. I was cool with it.
Only one time did I interview with a place where I asked if I'd be given a choice what hardware/OS I could use. The response was "We use Windows". My response was, "no we do not. Either I will not be using Windows with you, or I will not be using Windows NOT with you". I didn't get an offer. I was cool with it.