Samsung's industrial chain is a one-stop process from design to production, while Apple is only responsible for design, which is the difference between the two companies.
Early Apple mobile phones, such as iPhone 3G, directly used Samsung processor (S5PC1), and Apple's A4 processor actually came from Samsung processor magic change. Until A5 processor, Apple completely got rid of Samsung and embarked on the road of chip independence.
Many people know that Apple's A-series chips are very powerful. Basically, each generation of A-series chips is the strongest chip in the mobile phone industry. But it is because of Apple's strong chip design ability that A-chip can be regarded as the magic weapon for iphone and other products. Do you want to use the strongest A12 processor? Then you can only buy Apple's iphone xs and other products.
Moreover, the A-series chips are also adapted to Apple's closed IOS ecosystem and hardware. Even if the performance is powerful, it is not necessarily good if it is really installed in a Samsung mobile phone. As for why Samsung uses Qualcomm when it has its own processor, I think Samsung's own Orion chip is still inferior to Qualcomm.
Relatively speaking, the sales of Qualcomm's Xiaolong 8 chip in high-end machines will be better, while Samsung Orion chip is enough for some low-end models. Of course, Samsung has used both chips at the same time, but most consumers are still willing to choose Qualcomm's chip.
In fact, Samsung does not only OEM chips for Apple, but also some of Huawei's Kirin chips. Huawei is not worried that its core technology will be stolen. Protecting customers' exclusive patents is also the basis for the survival of various generations of factories. In this respect, the technology industry as a whole is still very standardized.
Actually, Apple's processor is not superior to Qualcomm's, but it is the most suitable for iOS. Samsung won't use it and Apple won't sell it!