Who are Apple's competitors?

I have an assignment about customer service in Marketing and one of it's tasks is to illustrate with the use of appropriate examples how apple has managed to create a competitive advantage over it's competitors. So first I wanted to compare prices, sales and profits of Apple and it's competitors and that's where it hit me. Who exactly are Apple's competitors. It can be Android but Apple produces iPhones and tablets while Android is an operating system used by Samsung, Nexus, and a lot of phone companies. When it comes to computers there's Microsoft but again apple makes macs while Microsoft is used by pc companies like dell, Sony and Acer. And still when I search about it Microsoft and Android come up.

Yes and there are Google Chrome computers too. It is a crazy world.

I think that Horace Dediu wrote almost everything here: http://www.asymco.com/2012/01/16/apple-is-the-top-personal-computer-vendor/

Of course on his site - Asymco you can find different analysis and comments about that.

Let me say Google, and Microsoft. Usually the big three.

Dell is one. HP is another.

Google.

Google.
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