Intel has been trying its hardest to get Apple to fab something with them for years, the idea that they were "too good" or "too competitive" and thus threw out billions of dollars in revenue is ridiculous on its face. It isn't surprising given the caste of characters on this forum that such blatant falsehoods are plastered all over the boards, but I guess that's just the way things are here.
Intel's process has some slight advantages to TSMCs, but intel also has huge downsides such as lack of in house IP and zero experience doing anything for anybody but themselves. The advantages intel has are the electrical characteristics of their transistors, but their density actually appears to be inferior to TSMCs 16FF+ and especially Samsung 14FF. They've also been attempting to fab Altera FPGAs since 2014 with little success. Given these facts, it is obvious why Apple has chosen to go elsewhere.
OP, be careful what you wish for. The intel modem they managed to jam into a few unfortunate iPhones is actually inferior to Qualcomm's competing version (it is CAT10 450Mbps while Qualcomm has CAT12 650Mbps capabilities), this has already resulted in poorer performance on the new iPhone 7. I'm pretty sure Apple will dump them next year, but for now Apple has chosen to artificially limit Qualcomm modems to CAT10 in order to have uniformity in their product. So, adding intel parts to the iPhone did nothing but make it perform poorer. Why would you want an intel SoC to slow your iPhone down?