Other than having a more stable and faster booting OP, not many advantages. Hardware wise, it’s not hard to match the specs of mac with a PC (mac’s are practically just Intel based PCs). I own a Mac mini to edit in Final Cut and a PC I built that I run Premiere, After Effects,Avid etc. I tend to work on my PC more often than my mac (event though I run the same programs on both minus final cut).
FCPX is not something I’d recommend. It’s a cheap yes, but it’s very limited in comparison to FCP7, Premiere, and Avid (and I have both FCP7 and FCPX). But FCP7 is not sold anymore (which is the only mac software exclusive listed). But if you’re are aware of all the limitations and if it wouldn’t be problematic with your workflow then go ahead and get it. At the very least you’ll get a great ProRes codec out of it.
Cost wise, macs are going to be more expense than PCs (and that’s before a Ram upgrade). So your not going to save money hardware wise going to a mac.