BUF04 vs BUF634

I've been looking for a good buffer and the analog devices BUF04 sounds to be a great contender, but it's rather hard to find. BB has the BUF634 which is easier to get and is also in 5-pin to-220 form (which I like), but how does it compare to the BUF04?

Also, if I go with the BUF634, could paralleling a few of these (say 4) improve their performance, or would it just add distortion?