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Whenever I see a request like this, it makes me wonder.
You have a job to do. If it's drawing, then you need the right drawing tool
for the job. Don't complicate it by limiting to a specific OS or hardware
platform, or worse yet, limited to those that are "in vogue." Pick the tool.
If it's on an OS or platform that you're not using, go ahead and add it to
your collection. At the very least, you'll have some valuable experience
that you otherwise wouldn't have had. There's a reason why professional
animators don't use mainstream iron - though they could and though
mainstream iron is cheaper. There is a business reason why there is still a
proliferation of OSs and platform types.
Get the job done with the right tool regardless of the other qualifications
and chances are it'll get done faster and cheaper.