I was recently fondling clutches (heh) in one of my local boutiques and I absolutely positively fell in love with the Kelly Longue!! If they had had one in any color other than Rose Dragee, I would totally have walked out with it that day. (The rose just doesn't work for me personally though I think it's lovely).
The Kelly Pochette struck me personally as more casual, I think because of the way the handle is attached or something. It also was cuter to me personally in bright colors rather than black. I saw it in blue jean, black and in orange--all with PHW, and all of them were in Swift. (edited to correct the colors I saw and add the leather)
The Maharani, which was available in black box at that moment, was absolutely stunning and very under the radar, it was just significantly larger than the Kelly Longue, and I felt that it would hold even less than either the KL or KP because it's very thin when viewed from the side. It also felt more formal to me, maybe because it was in box?
The Kelly Longue struck the right balance for me of formal vs. casual--I felt that I might actually carry it sometimes during the day because the hardware made it slightly less formal than the Maharani, but the shape was more appealing to me for formal events than that of the KP.
So, for my personal needs, the Kelly Longue won out but sadly I was unable to bring one home.
Hope this helps!