If you had to choose one and only one between the two, would you choose a Nintendo Switch at $300 or an Xbox Scorpio for $400 ASSUMING you do NOT already have a current gen Xbox One console?  Yes, the Scorpio has yet to be priced.  But given that the Scorpio is more powerful than the Switch and the PS4 Pro is already at $400 since November of last year, $400 for the Scorpio seems to be a fairly reasonable estimate.  All prices are shown as USD.

I'd be really, really surprised if they hit the $400 mark for Scorpio. Kinda expecting it to be closer to $500 at least.

Important question though, can we already own a PS4? If so, then the Switch no question.

If 400$ is the mark, which I doubt, then I would say with a cave voice "Scorpio wins, fatality!"

Well assuming it will be $400

I'd rather spend $150 more and get

Switch $300
Ps4/x1 $250

And have access to a wider selection of games. If the Scorpio is priced more than $400, that deal becomes sweeter.

I choose the Switch. The correct option.

Sorry, but the Switch. If I wanted an Xbox console. I'd go with an original, or a slim.

since I already have a xbox I'd go with the switch but if I didn't I'd go with the xbox.

Dood, I got a PC.

Scorpio .. no question!

Yes, there are a variety of factors to consider, and it would be impossible to account for everyone's situation.  But I tried to place the Scorpio in the best light possible with the Switch by pricing it as low as reasonably possible and not already having an Xbox One console would be more incentive to buying a Scorpio not already have spend the funds on an earlier version.