Dual-boot or Parallels?

Hi all: I'm planning to build a machine that will be running 10.13 High Sierra. I do use a couple WinDOS programs, but not very often. So I ask: should I make my machine a dual-boot with two drives (one macOS and one WinDOS 7), or just one drive with macOS and use Parallels to run the stuff that I sometimes need?

I do have a couple of concerns: I've seen that Dell machines all have a blue SATA port ("SATA 0" on each and every one) and that's always where the boot drive gets plugged in...

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