I think the former (now deceased) founder for Apple was simply around at the right place at the right time when they built the Apple I around 1976 which allowed them to proceed with the Apple ][ (in 1977) and the rest is sort of history.
Bill Gates is merely the other bod which was around at the right place and the right time and can thank Gary Kildall's Wife for allowing that to happen.
And basically everything sort of went right for Apple and Microsoft and anything which went onto the backburner went to Digital Research, Inc. That doesn't mean what happened was correct and even Apple lost battles to Microsoft when they sued Microsoft for their Windows! Though everyone knows DOS was a rip-off of CP/M, It didn't stop CP/M from evolving which exists under a number of systems, it's dominance was simply more evident in 8bit systems, DRs GUI GEM (v1.2 I think from memory) is actually quite a nice GUI to use, however later versions suffered because Apple put the clamps on GEM (through a lawsuit in the mid-80s) on the PC because it was so simular to Apple GUI. Apple tried the same stunt with Microsoft though failed cause Microsoft were careful not to make it like a MacOS.
Though put all that aside, I've been using Apples since I was at Primary School (probably the next machine I was using after the CPC464), which I think was an Apple ][e. They also had a Mac Plus which was probably the first GUI I came to use. In them early days for me I was mainly using Apple ][e's though, did some Word Processing and played around with some Graphics program (one which had all these Garfield figurines in it which was interactive) and also played a game where you had to travel around the world trying to catch a crim and follow the flags and clues along the way to catch them!
But I've also used an Apple ][c from 1984 which is a nice compact machine with the Disk Drive built into the computer and has a small green screen monitor. I think that machine had 128k and early ][e's had 64k. And going through School I thought we were using Mac Classic's which had the Greyscale screens (looks a bit like a
Mac SE). A few years ago I brought myself a Mac book Pro which I've been fairly happy with, though still using the PC with WinXP.