If what I'm playing fits with it, I'd go with option 1) - all four fingers on the string and pull one at a time.

However, there are times when I'll do it the second way - specifically when I'm playing something where I'm skipping strings and the run doesn't lend itself to having all four fingers tied up in a line. Also, like Benoit says, I'll often slide down to the last note.

I think the best approach depends totally on the context - but I don't think that either way will prove a limitation in the future....