Clip 3 is an older model and uses micro USB. I have the Clip 4 and it's pretty great for the size.
Charge Essential is also an old model and micro USB. There are 2 different Essentials: Flip Essential, and Charge Essential. I have a Flip 4 and a Charge 5, Charge is the larger more powerful range, so I think this Essential is probably the better of the two. I honestly have nfi
Boombox 2 new one is coming out but looks about the same. This is a 6kg beast with 4" woofers and 24 hours playtime. These big ones, like the Xtreme and Partybox range are charged with AC adapters, not USB
I have a Partybox, but I can't remember which one. I will be getting the Boombox 2 because it fills the gap between my Charge 5 and Partybox.
partybox - the battery one i heard is the best