Better and best are derivatives of "GOOD."
An interesting way to think of "better" is as a combination of "GOOD + ER," and "best" as a combination of "GOOD + EST."
Good: (For more info, check out the "GOOD" page.)
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better:
The sign for better comes out to the right a bit.
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BEST:
Notice that the sign for BEST makes a much bigger movement. It actually dips down a bit for emphasis prior to moving "way up." The more you exaggerate this sign, the more your are emphasizing how much better something is than the others.
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Notes: