Some more things to considered....
- The GPU in the PS4 is speculated to be equal to (if not slightly faster than) a Radeon HD 7850.
- The GTX 765m is ranked below the Radeon HD 5850 in the following link which means it is a bit slower than the Radeon HD 7850.
http/www.notebookcheck.net/NVIDIA-GeForce-GTX-765M.92907.0.html
- The XBox One's GPU will be slower than the PS4's so the GTX 765m may be on equal footing against that.
- Once a console is released, the main components will not change over the life of the console. Given how long the PS3 and Xbox 360 has been in existence. A minimum 6 year lifespan is more or less guaranteed.
- Since the hardware does not change, games released for the PS4 / XBox1 in 2019 will run on the console purchased in 2013 / 2014.
- Laptop technology moves with desktop technology. But naturally laptop components will not be as powerful or inexpensive as desktop components because:
a) They must be designed to fit in a confined space.
b) They cannot draw too much power because of battery life.
c) They cannot produce too much heat because limited space / size prevents effective cooling.
- Unlike consoles, components for PCs more or less comes out about every 9 - 12 months taking into consideration both new CPUs and GPUs. Because of this developers is also going to push the performance curve.
- Most games are designed desktops rather than laptops. Why? A high performance desktop PC is much less expensive than a high performance laptop; assuming to expect the exact same performance from both machine.
- While games that are released in 2019 for the PS4 / XBox 1 will be playable on a console bought in 2013 / 2014, the same cannot be said about PC games because of the ever advancing tech performance curve (i.e. new hardware). Playing a game released in 2019 on 2013 laptop will likely require you to play on low / medium graphic settings. Some games may not be playable at all.
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If I had to make a choice between an expensive gaming laptop (no desktop option) or the PS4 / XBox 1, I would choose the expensive laptop because I prefer to play with a keyboard / mouse. I would go with the laptop even though I probably know that I would replace it after 3 years so that I could get new hardware to keep up with the increasing demand of PC games.