I like my Ducky 1087 more than the Leopold TKL.
The Leo is more solidly built, has better keycaps with more appealing fonts, and has a channel guide for the USB cable, so you can easily route it right, left, or center. I think the Leo has a metal plate, and the Ducky has a plastic 'plate' of some sort (someone correct me if I'm wrong).
In spite of all that, the Ducky feels better to me, none of the keys squeak or sound 'odd', and the space bar sounds the same whether you depress it left or right of center (left vs right thumb). I'm being pretty anal, but these are things that definitely annoyed me on the Leo and are not present on my Ducky 1087. Also, I don't have any issues with the build quality of my Ducky 1087, and I think it was cheaper off of eBay vs the Leo, although I don't currently see it listed.
However, personally, I'm currently using a KBC Poker, and while it does have some pitfalls and takes a little getting used to, I think it's my current number one keyboard (I'll review it after I've had at least a week or two with it). Although I do yearn for some better quality US distributed Choc Mini layout keyboards.