Comparing Priority Admission and Regular Decision is not that hard to do. What is hard to understand is why anyone would miss applying by a college’s priority deadline and in the process settle for applying regular.
When you apply Regular Decision you are applying by a college’s regular deadline, which is typically in early winter (January or February). Students can apply to more than one college Regular Decision. Decisions tend to be received between March and April.
Priority Admission is when a college sets a date by which applications given the most consideration must be received. This date precedes such colleges’ Regular Decision deadlines. If offered by a college on your list, you would be crazy not to apply by this date.