It's difficult to make that comparison, though PC graphics cards are way better. However, as far as features are concerned, you get more for your money using a console, as well as two free games every month if you have a plus membership. On PC, you have lots of free titles as well, not to mention the programs you can run on PC, that won't on console.
The main problem people definitely don't understand is that 30 FPS console is smoother than 30 FPS PC. On console, this is playable, on PC, it's not (for most people anyway). Really, one could go on all day to list the pro's and con's. In the end, the PS4 is far more convenient than a PC, but lacks a lot of things (not all) people take advantage of. Main one being able to upgrade parts, to maintain your desired framerate/resolution/settings in newer games. That on consoles is non existant, if you find a game you want to play, you know it'll play just fine.
With a 750 Ti, it won't play future mutli games that are on PS and PC, maintaining the framerate and graphics quality. This may change as they are pushing DirectX12, or so the hype around it make it look like they are. But for the past 10 years or so, building a PC equivalent or slightly better than a console, won't last nearly as long, perhaps 1/4th the console lifespan at best, if we're talking about "matching" performance.
Comparing my Xbox One (I'm aware it's behind the PS4), but it's playable, and I have no complaints other than aliasing here and there. The PS4 scaler does a pretty bad job when it comes to contrast, but has better hardware than the Xbox One that I own. I don't like when people compare the two, because they are targeted at different market, but there are a ton of pro's and con's for both PC and PS platforms.