Others have mentioned software, and that is my main point.
If you switch from a PC to a Mac you will need to buy all new software, unless you go the Bootcamp route. Which means much more expense than a simple computer/OS upgrade. You could end up paying more for the software than the computer and OS, depending on what you need to use.
Even then, you will need to reboot the computer into Windows to use your current software (which may or may not run correctly under Bootcamp). And that really defeats the purpose, I would think, of having a Mac.
IMO, the only reason to switch from a PC to a Mac is if you had to use software that was only available for a Mac.
That is, if you wanted the more economical route. If you have money to burn and want to try a Mac, go for it and see which you like best.