diaper pail
We originally had the Diaper Genie but switched to the Ubbi. There's some thought the plastic absorbs odors over time, which I found to be true with the Diaper Genie. It smelled really bad after a year of use. The Ubbi is metal and supposedly less smell-carrying as a result. Added bonus: the Ubbi takes regular trash bags, whereas you have to buy these special bags for the diaper genie.
A note on placement: we originally had the diaper pail in the nursery, but have since moved it to the bathroom where it fits nicely under the sink.