The rebels are a bigger threat because they're are three of them. The Bounty Hunter is just one man, and in the end he'll probably get lynched or night killed or something. Rebels have some decent powers, and with all of us being experienced players, it will be tough to catch them.
I think an end vote is a bad idea, by the way. Day 1 lynches, while much more likely to be on a townie than a mafiaso, give a lot of information later on. Basically, I've come to appreciate them in retrospect. It's not so much about WHO we lynch, it's about HOW we lynch them... all the interactions, analysis, and information we can gather after the fact.
Anyway, I will join Warden just to get a vote in, and ##VOTE No-Lynch