Personal preference aside, I think it's imperative to know how to work both in today's world.
I agree.
All the jobs I've ever had, using computers, were with PCs and they were fine. I've been using a macbook for over 4 years now (the same one) to do everything and it has worked great. It is still fast. I know it's personal preference, and I prefer MACs because it does what I need and I don't have to worry about buying parts, running the virus scan weekly, purchasing an updated virus scan software every year, defragging, etc. MACs are not the greatest thing in the world (I've had my share of problems) but for people who don't like to mess with parts or installing this and that, etc, it's a good investment.