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The Atari 8-bit series of computers was around for a very long time. The Atari 400 and 800 were first introduced in 1977. While the Commodore 64 and Apple II would be the most direct competitors, the Commodore 64 wouldn't even be around for another few more years. However, once the Commodore 64 was introduced it was all downhill for the Atari 8-bits. While the Commodore 64 had a few technical advantages, they were really very similar in capability. However, the Commodore 64 had huge advantages in price and ultimately in 3rd party software support.
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