Comment by runevault
I wouldn't say A because Nintendo hasn't bothered trying to compete with them. If they bothered and Sony still managed to be considered a separate category I would agree, but Nintendo appears to not care about them.
However I do think B is true. The only time they were able to go toe to toe with Sony was most of the 360 era when Sony got cocky and built a machine that was too complicated to work with relative to the value developers got out of that effort. Once Sony stopped doing that they've dominated Xbox (mind you the whiff on being too early proclaiming the digital era made it far far worse).