Probably Switch, but as everyone has said it will depend on supply.
Weekly sales, it looks like Switch is winning and this is with retailers barely being able to keep them in the stores. Gamestop has said that it sells out in hours. Best Buy and Gamestop both saw earnings boost from Switch.
If you look at the first full fiscal year, The DS sold 11.4, the Wii sold 18.6, and the 3DS sold 13.5 million. The Wii sold 5.8 million from launch to the end of its first fiscal year. So even with supply constraints, Nintendo is able to sell a lot of units. Sony is projecting to ship 18 million, but I think that number is an overstatement. The PS4 is in its 4th year. Since consoles tend to decline after year 3, we should see it fall (which may also be a reason this comparison is somewhat unfair to Sony). Moreover, Sony has succeeded due to a lack of competition. Most of Sony's rise (primarily in software) can be explained by the decline in Microsoft's sales. Sony now has real competition with Switch. A PS4 is about the same price and the system has more games, but Switch sales are stronger in Japan and America. This may change in Europe eventually as the DS sold better in Europe than it did in America at least for the first few years. So couple Nintendo potentially selling 15-17 million this year (based on sales of the Wii and DS) and Sony not making their 18 million goal, I'd go with Switch.
BTW, you can find all the numbers at Nintendo's investor relation website.
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