Majors are highly volatile, exotic pairs are less volatile, the answer is simple. However, there are some majors that are considered to be the least volatile ones, like USD/CHF for example. It depends on the current situation on the market, but the fact that majors are more liquid is indisputable.
Try to trade different currencies to notice particular regularities and then you will be able to understand which one are better to avoid and which one are the tastiest. Cheers.