Co-sleeper bassinet vs. regular bassinet or pack n play?

Sarah
I've been doing some research on the arm's reach co-sleeper that attaches to your bed and think I want to use that for that first few months. However, my boyfriend thinks we should just use a pack and play that has the bassinet on top. I also plan on breastfeeding which is why I thought the co-sleeper would be more convenient. Either way, I want the baby to be next to me in some type of bassinet for the first few months.  
Anyone have any thoughts or suggestions? I know the pack and play would be more useful as it has more than one use, but wasn't sure how great it was as a bassinet.