.... this is going to end up with me bringing in way too many characters, isn't it....
I'd like to reassure you and say no, but my first thought on "dwarves or hobbits?" is "both? all of them??", so... No, but really, whoever you feel most inspired by - I'm sure it'll be great either way. If I had to pick I'd maybe say Fíli just because Legolas + dwarves is fun, and we've already had several threads with him and Thorin already.
I'd be so happy if you did, that's instant BFF stuff right there. What Is This Feeling? would play in the background during their entire interaction.