From March to June 30th Nintendo Switch's sales were 4.7, making it so that an average of 38,524 consoles were sold per day. Playstation 4 sold 3.3 million consoles from April 1st to June 30th, making it sell an average of 36,263 consoles were sold per day. Obviously averages aren't accurate though and when you consider how front loaded the Switch sales are in it's first month(57% of Switch sales were in it's first month), Playstation 4 has a great chance of exceeding the Switch and the 3ds this year. Sony expects to sell 18 million PS4's by the end of this year, Nintendo expect 10 million Switch's to be sold and 6 million 3Ds to be sold through to March of the fiscal year.
Playstation 4 is already on track to sell 13 million but including Uncharted and Novemember/December sales it's very likely to beat Nintendo.
What will be interesting is seeing if Nintendo can beat the 10 million projection. The 3DS will likely end around 6 million, but the Switch has the potential to go much higher than 10 million if they can just produce enough. The 3DS shipped 13.53 million in its first fiscal year, but it was only at 0.71 million as of Q1, while the Switch is at 1.96 million.
I forgot to mention the projections are all fiscal year, so 6 million 3ds's by march 2018, 10 million switch's by march 2018, and 18 million PS4's by then.
Personally I don't see the Switch surpassing the 10 million mark, at least not that much. I see it selling a little worse or better than 10 million(from April1st to March 30th 2018). I think it will sell 7.26 or so million units by December, but after that the Switch will just be playing ketchup, where all the sales mainly go from people who couldn't buy a switch with mario by the holidays. I say this even when taking into consideration that a Yoshi or a Kirby might launch early 2018. The more Switch units sell, the more Nintendo need to give people a reason to get up and buy a console. After Mario there isn't an immediate solution for a console seller, so they're really going to just be selling to the people who don't have a Switch yet. Especially since Switch sold 2 million from April 1st to June 30th, that means that an extra million is likely for a 3 month period, but not much else. The PS4 without supply constraints sold 3.3 million in that timeframe. It is hard to speculate since I don't know much about how much Splatoon 2 will penetrate the US and UK markets in terms of console sales.