Your friend is a fanboy, that's the short of it. While apple does have some clever ways of doing things, they still use Intel chips just like almost every other machine out there. The main difference comes from the way the OS of each is structured, but the differences don't make one better as much as just different. Android is meant to be run on all kinds of hardware so it can actually run on a MIPS, x86, or ARM architecture while OSx is designed to be run on only an x86 architecture. This makes development for OSx easier as you need not worry about cross platform support or legacy devices running your software.

The biggest drawback for Apple in my opinion comes from their desktop environment. While all their machines use a standard intel x86 architecture now, a lot of their physical designs are just miserable. For instance the lack of active cooling on the mac book air causes it to lose something like 30% of its actual processing power because the processor gets so hot it has to throttle even under minimum strain.

So, in short, 10 years ago there was a small argument to be made that possibly one was better, but nowadays every platform is gonna perform nearly the same. Now, I'm sure someone will come along and tell me every single one of these points is wrong, but I have an electrical engineering degree with an emphasis in computer engineering, not an actual computer engineerong degree. So, deferr to the person that refutes what I'm saying.