What is it you like about OSX. I had to use it in unversity for audio engineering classes since all computers in the art building were macs.
Here are my gripes:
1. The windows do not 'snap' (resize themselves to fit to a fixed portion of the screen by being dragged or with a command)
2. The menu is located on the top of the screen. If my application is not fullscreen (which would be the case if I was trying to read something the screen was positioned awkwardly high due me being in a broken chair), This would require the user to move their mouse farther than they would in any OS with a menu bar located on the application itself in order to interact the application menus.
3. The buttons are on the left and color coded. Even ignoring the eyesore colors why can't they just move them to the right like everyone else?
4. Some of the default shortcuts are just plain stupid. Like ctrl+shift+z for redo.
5. The OS assumes the user will use the same set of programs and loads a lot of them into memory on startup causing lesser used programs to lag. (This may be fixed now, I was using 1 or 2 versions before "El Capitan").
I am well aware that there is software available to remedy some of this, but this isn't Linux I expect it to be complete out of the box. It really seems like a poorly designed OS with un-intuitive features designed to make transitioning to a competing system difficult.