IMO, PSV will have a better launch and has a chance to not only match but to surpass 3DS total sales in the first year.
After that I think the 3DS will, slowly but steadily, sell more than PSV and will end selling more.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.