To Sling or Not To Sling

That is the question. So I'm trying to get ready for this little babe and I only have a couple of items, besides clothing, that I still need to get. The one item that is on the top of my list right now is either a sling or a front pack. I'm not really sure which way to go. So, I pose the question for you...should I purchase a sling or a front pack? Please let me know what you have used, what is good and bad, and what you will continue to use with other kiddos. I have a hard time making decisions about purchases, and feel more comfortable with input from people who have actually used the items. So thanks in advance for your help!!