@Strohkopf
I think a better question to ask yourself is this: "What do I mainly work on my computer?"
For me, I'm a graphics designer, therefore, I got a Quadro P2000. Yes, I could have gotten a GTX 1080-whatever model is the latest, but I'm not a gamer. Well, I do play games, but not enough for it to justify me getting a gaming card over a graphics design card.
If you are mainly a graphics designer, Photoshop, After Effects, 3ds Max, Maya, C4D, Modo (etc...), then I'd say for you to get a quadro card. It can still game, though you won't get over 9,000 fps at 4K. However, if you are a gamer, and you play games a lot more than you do graphic design stuff, then I would get a GTX card.
The flipside is that 3ds Max, Maya, Modo, and C4D, are not "certified" to work with gaming cards. They will work, but there may be stability/reliability/performance issues. I once tried a GTX 980Ti with Modo, and it failed to render the viewports at all. However, when I swapped it out for a Quadro K620, all was fine and Modo functioned properly. There was another instance where I used the same card on 3ds Max. I was using the same GTX 980Ti card and I was working with a model with excess of 4 million polygons. The framerate was awful, it chugged along while GPU-Z was reporting a large load on the video card. I did the same thing and swapped the card out for my Quadro K620. The same project file and model, worked flawlessly. Frame rates were super smooth and GPU-Z reported the load on the card was substantially lower than that of the GTX 980Ti. The performance with the K620 Quadro was much superior than that of the GTX 980Ti. (This was my experience, I cannot speak for others, but just as a heads up.)
A better way of putting this is that you may want to look at reliability vs. cost. How much do you need reliability? For me, I'd like fluid frame rates in my 3d programs, otherwise I won't be able to get much done, especially if there's compatibility issues with the program and my video card.
(By the way, I have a Quadro P2000, while I don't play games much, I'm still able to play games on my 4k monitor at medium to high settings with very good frame rates.)