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Which of those is valid? I prefer reading or I prefer to read?
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They're both fine. Just be certain that the "option" makes a parallel construction.

I prefer reading the book over seeing the movie.

I prefer to see the movie rather than to read the book
Comments  
Both are correct.
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 Philip's reply was promoted to an answer.
I prefer reading the book over seeing the movie.

Also, I prefer reading the book to seeing the movie.

I prefer to read.

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I 'd prefer to order a takeaway

anonymous

I'd prefer to order a takeaway.

No sentence is correct if it doesn't with a punctuation mark.