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I don't really observed some dominant hardware anymore. From the software side, Linux of course is very much dominant now. Otherwise you see a bit MacOSX, and also OpenBSD, FreeBSD, or more exotic things. Windows is rare, and people even feel ashamed to show that they use Windows. But that was more extreme earlier, and slowly becomes more accepted. Maybe more now with Windows Subsystem for Linux.

Not at all. Running Windows is a sign that you're willing to run a substandard OS with no good toolchains and low/no privacy. And none of the Linux attacks that rely on hardware/firmware stuff works on Windows system for Linux.

I can load up instances of Linux catered to specific ideas (Tails, Buscador, RadioInstigator, etc) and they will just work.

Now we also know how to handle windows, especially when we break into machines and networks with Windows clients and/or AD. Most orgs don't understand even how windows runs, so they get it wrong unsurprisingly.

Speaking about the CCC, I'd say the MacBook remains in the top-2, but the Thinkpads are clearly prominent.

Thinkpad T or X series

I'm betting many flavors of Linux running on many flavors of laptop.