Which system should I buy?

The first is better

I think the first thing you need to decide on what games you like to play. Whether those games have a better platform on PS4 or on PC. Also some titles are exclusive to certain platforms etc. The other thing is if you like to mod your gaming experience, if so then a PC is the way to go. The specs really are not an issue with a Ps4, as a PS4 will obviously play all PS4 games well at good res, as thats what they are designed to do. If you play heaps then you will future proof yourself if going for a PC by getting the grunttiest beast you can afford. I am more into startegy games but like to mix it up with some FPS every now and then and have a mean as PC, but then have never been a guy who likes consoles as prefer the mouse and keyboard as controls. My other issue is that we only have one TV so gotta share it with the rest of the household.

If you are looking for a PC then I also suggest having a look online at some of the smaller independent guys as you can often custom you own machine from them cheaper than buying direct from a big commercial retailer and get exactly what you want.

I would buy pc unless you already have a great pc