Is it better to replace just the CV boot, or the entire axle?

Q&A with Faye! #1!
You ask me questions, and I do my best to answer them.
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Today's question is "I have CV Boot issues, is it best to buy a whole kit [axle] or just the boots to replace?"
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You can ask me a question of your own on my Facebook, on Instagram (@pistonsandpixiedust) or via email [e-mail]
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You can also find me on the web, and hire me as your mechanic (!!!) at www.pistonsandpixiedust.com