What is the difference between balloon angioplasty and regular angioplasty?

Several types: Of angioplasty. Can stretch vessel with balloon or different sizes of catheters ( dotter technique). Or can make vessel bigger in surgery with patch angioplasty, where extra material sewn into vessel, like letting out you pants.

Essentially none: Historically there have been a variety of methods to repair arterial narrowings. Now almost all are done with a balloon device of some sort.