If, at arrowpoint, I was forced to play a stock class, I would have to choose between the magey marksman that is the witchhunter or the stealthy marksman that is the agent. Ah, searching for a mystic archer. The witchhunter having both sneak and alchemy as majors would level at a sickenly fast pace for me. The agent is only somewhat better with sneak as a major. Ultimately, my vote went for the agent because of their skill with both bow and illusion, and because it might be a tad easier to try and level properly.
Oh thank Mara for custom classes.