They're right, it all depends on how you use the devices and how they're working for you.
If you're hesitant to make the switch to a Mac, I made the transition in 2009 with a 13" MBP that I still have and it runs like new. I've upgraded the memory and transitioned to a SSD, but otherwise it's a six year old laptop that runs great. I never had a PC last more than two years. I'm quite happy to have switched over.
That having been said, if you do anything work related on your laptop that requires specific software, etc, do your homework. My wife wanted a Mac for a while, but was working in real estate and none of the software she was required to use by her broker and agency was available for Mac.