I look at it this way
I almost bought an AMD Cpu but decided against it because the Intel offering was just so much better, more expensive yes but overall just better, less wattage, less heat, better performance and major factor being that no devs were coding for multiple cores on games so while my i7 might have 4 physical cores and 8 threads, it was still a faster chip overall as opposed to a true 8 core cpu.
With regards to GPU, i normally go with AMD purely because their price to performance ratio is much much much better than Nvidia, i dont agree that Nvidia rinse peoples wallets for the performance they offer where as AMD normally come very close for significantly cheaper, plus Nvidia are just shady all over as well, i imagine a bunch of black suit wearing, sunglass indoors wearing douchebags sat around drinking brandy and smoking cigars laughing at their consumers, as their board of directors.
Also regarding mobiles, i was Android for many years until i bought the Samsung Galaxy S3 at release, worst piece of junk ive ever owned, i had the HTC Desire HD prior to that and it was a superb phone, the Samsung was just utter trash, plastic rubbish, i will never ever buy another one of their phones, so i moved to Apple, i like the Iphone but i will probably go back to HTC at some point, their phones are just extremely well made.