It seems almost random the way companies deal with holiday pay. Some divide sick days and holidays, allowing only so many of each. Others give employees a lump sum of paid days off, allowing them to mix them up as they want for vacations, holidays or personal days.
Finding out up front what a company's policies are and how those days accrue is a great idea. Finding out the exact number of paid "calendar" days an employee is granted is good, too. For example, most companies give Thanksgiving day off with pay, but what about the day after? How about New Year's Eve? A company with generous paid time off benefits is in a great position to retain employees and attract new ones.