When I started playing MHFU, I got interested into long swords and occassionally I use heavy bowguns (mostly against Plesioth and Kirin). I also prefer to use Dual Swords against Rajang.
After I bought MHTri, I mostly used long swords and switch axes at first, but then at the higher levels I finally taught myself how to use lances properly. This carried over to MHFU aswell, and so I'm using both lances and gunlances too.
I don't like hammers (I prefer hunting horns over hammers) all that much, but I did use them in MHTri during arena quests.
By the looks of things, I'm either going to be a lance/gunlance or long sword user in MHP3rd. Just hope I get myself a PS3 before then so I can hop on and play online.