If your work is good it shouldn't matter what platform you use.
That's true. But it does not alter the fact that you will encounter people in hiring positions who are slaves to a platform and hire accordingly.
One of those gaps between "should" and "is..."
'Cause you know, photoshop for on a Mac is like another world.
A production designer with whom I work frequently, asked me to teach him Photoshop, while we were on location.
For some opaque reason, the menus have been shuffled, from the PC to Mac versions (haven't used Photoshop on a mac in many years), which is just about the most pointlessly idiotic thing I have seen done with a port - now I effectively have to learn a program I already know, all over again, 'cause I can't find the f*cking controls which, for no good reason at all, have basically been hidden.
*grumble*