Paramecia: Basil Hawkin's and Doflamingo's unnamed DFs, mainly because of their mysterious qualities. If I had to choose a named/known DF, though, I'd say the Nikyu² no mi since it allows you to push anything, from animate objects to things inanimate like emotions or pain. Not to mention, it gives you the ability to damn near teleport. (though I will give a nod to the Gura² no mi too, simply for being a world-breaker class fruit.)
Zoan: Not too many to choose from, so I'd say it'd be Lucci's Neko² no mi, model: leopard. Why? Like I said, not too many to choose from, but I do like Lucci's half-form the best.
Logia: Can't decide. It'd be between Hie², Pika², and Goro² no mi's. Power to freeze things, or the power to beam things and move at the speed of light (perhaps?), or the ability to teleport almost at the speed of light and rain lightning?! Well shit, Kizaru and Enel are damn near almost the same, with the exception that they're different elements, but teleporting and having endless energy. Though, Enel does have that rubber weakness, as opposed to Kizaru having no weaknesses (so far). Still, Aokiji's ice powers are awesome too…
...yeah, this one's a hard one to choose...