I suggest too that you buy whatever best suits your available budget so that you don't regret and remake this decision too early. It's perfectly valid and reasonable to say "stick to the most modest equipment when you are starting out", but hey, "starting out" has nothing to do with "seriousness" or "willing to take on a whole new path".
Buying Canon or Nikon does not matter. High end models compete similarly.
Again, this is fake: "Note that Canon FF body only can accept L lense".