I don't think it's easier to use rekordbox with a Mac... a well configured PC should work just fine with rekordbox.
I've been using PC's almost my entire life, but I switched to Mac 4 years ago and I don't regret that decision. Today I'm using two MBP's and one iMac.
The advantage with Apple products like Mac's and iOS devices is that there's only one manufacturer. In the PC and Android world it's several manufacturers that uses different HW.
If you're looking for a laptop for DJ'ing and gigs, then I would recommend a MacBook Pro! It's rock solid!