there are more 3ds out there, no reason to talk about this.
The thing is that the vita has a higher atach rate.
Attach rate = sold games : Platform sales.
Wikipedia example
- Platform A has sold 1,000 hardware units
- Platform B has sold 10,000 hardware units
- Publishers have sold 5,000 titles for Platform A
- Publishers have sold 10,000 titles for Platform B
In absolute terms,
Platform B is outselling
Platform A by a factor of 10:1, but
Platform A has a much higher attach rate (5:1 versus 1:1). Thus for a content provider,
Platform A may be more attractive, since at current attach rates the platform only needs to sell another 1,000 units for publishers to match their sales on
Platform B.
Also it was reported that 70% of all brought vita games where purchased through the PSN.