Depends on your purpose.
If you're a hard core gamer, then Ps4 would suit you better.. There's a vast game library for you to select, proven online services etc.
On the other hand, switch is an unproven but have potentials. The main attraction about switch is that it's portable, and allow for local multiplayers between consoles.
For me personally, I went for the switch, because I know I won't have the luxury to sit infront of the TV and enjoy the gaming console.. So switch works out well for me, and I'm able to enjoy gaming on the go, or infront of the TV if I have time.