The Serkis ones are good, but I really love the old Rob Inglis versions. Someone described them as the closest thing to Tolkien himself reading the books.
Surprisingly I think some of his voices (eg, Gandalf) do match the vibe of the films better; even his Gollum isn't too far off.
I haven't heard Serkis's narration, but it's hard to beat Inglis. I certainly wouldn't object to narration influenced by Jackson's films -- though I have my share of problems with Jackson's adaptation, I think he did a fine job of casting and directing.
Surprisingly I think some of his voices (eg, Gandalf) do match the vibe of the films better; even his Gollum isn't too far off.