Running with or without a FB?

Ive thought about this quite a bit when trying different plays and working on them, do you prefer to run with or without the FB? With the FB you get another guy pushing directly in front of the runner but do you think it holds the runner up from getting to "the hole"? Or do you prefer to run another TE and design your runs to "bounce" outside? I think having a FB on the field gives you another option for things like the FB trap and a quick hitter down at the goal line since he doesnt have as far to go. It seems like there are pros and cons and its a matter of personal opinion so whats yours?