No.
This is a bit of a strange strange question, as most of the phone manufacturers use the same suppliers, and don't actually make anything in the phone themselves. It's like asking if a PC from Dell or HP is better, with the identical specs - nothing in the PC is actually made by either company, they just put a box around it and stamp it with their brand - phones are no different.
In the 6P:
Qualcomm makes the processor
Sony makes the camera sensor (IMX377)
Samsung makes the screen
Micron makes the 3GB RAM
Samsung makes the flash storage (32, 64, 128 GB)
Broadcom makes the WiFi hardware
etc. etc.
Most phone companies use the same or similar manufacturers for internals, and there is nothing special about Apple internals. For example on the iPhone 6S:
Samsung and TSMC make the processor (The TSMC one is better, the Samsung one has been linked to some issues already - oops!)
Samsung makes the 2GB RAM
Sony makes the camera sensor
Qualcomm makes the LTE modem
Toshiba makes the flash storage
Qualcomm handles the power management
etc. etc.
Lots of other companies involved too, like Texas Instruments, Skyworks, Bosch, etc. for small controllers, accelerometers, etc.
The reality is that the R&D as well as the fabrication equipment required for each individual component are not worth the investment to the phone companies (not to mention a ridiculously large undertaking), so they outsource pretty well everything, either picking it out of a catalog or having it built on contract to their specification.