People's true colours showing through in this thread. Jesus. To say "Lack of PS4 exclusives" and "unusual sorts who prefer PS4 exclusives" after the year that system has had so far, well, I never.
OP it comes down to what you want to play more, Nintendo or Sony exclusives. Both systems complement PC well, although the PS4 of course has a lot more overlap with PC. If you were to buy a Switch, you'd likely eventually have far more unique content to enjoy there + portability which is oh so glorious. So far you've got Zelda, ARMS, Splatoon 2, MK8D and Super Mario Odyssey, FE Warriors and Xenoblade 2 still to come this year. That's a lot to get stuck into for such a young system, and while 2018 is still a bit of a mystery it'll only get better.
Having said that, it's still fairly new, and PS4 naturally has more exclusives games under its belt. Bloodborne, Horizon, Nioh, Persona 5, The Last Guardian, Gravity Rush 2, Ratchet and Clank, Uncharted 4, Digimon Story Cyber Sleuth etc. And if you didn't own a PS3 then there are some cool remasters to catch up on. Don't sleep on The Last of Us.
You can't go wrong with either, which is why really I think it's best to have both. But weigh up the pros and cons based on what experiences you want from this supplemental console and go from there. My hot take says go with a Switch, but a case can easily be made for a PS4 too.