netmeg - 10:03 pm on Jun 23, 2011 (gmt 0)
FWIW, launched two sites over Memorial Day, submitted XML sitemaps for them, linked them to each other once, plus each had one link from one of my other sites, the usual FB and Twitter presences, and one was getting Google traffic within three days, is now ranking and fully indexed. We messed up the URLs on the other one, so that took longer, but was finally fully indexed and getting traffic last week. YMMV.
So my answer to your question is - both.