I'd prefer to have them all, if the hub is well researched, written, and presented and is of general interest. In order of priority, I'd say:
1. Facebook and then Twitter and then Pinterest, because I read that backlinks are important;
2. Comments, because that tells me who has looked at and responded to my hub and may be my introduction to a hubber whose hubs I admire and want to follow;
3. Up and accolades because they are nice and let me know that someone thought the hub was useful or interesting or whatever.
I'm unclear what the Up signifies. i don't know what the official criteria are. My tentative working criteria have been Down (used very rarely) if the hub is inappropriate, such as is virtually some company's infomercial; neither Up nor Down (an uncommon choice for me) if the hub is of no interest to me, usually because of a dearth of content or because of bland, pointless content or because it reads like a first draft that needs work, or Up (my default usual choice) if the hub is at least a little bit interesting and/or useful.