Faction and Muskets (Risen 3: Titan Lords)

I like muskets and rifles, going with that weapon through the entire game. Now approaching the moment of choice of the faction, hence the question: which faction is focusing on the muskets? Or which factions will be most useful if I'm not going to go on melee and magic? I would also like to know in advance whether there are any problems with finding a more powerful muskets? At the moment, running around with the one I bought almost the very beginning..