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What's the Difference Between an Open or Hollow Stud, and Solid Stud Brick?

What's the difference between an open stud brick, and solid stud brick? Should I watch out on which one I use?
Brick, Modified 1 x 1 with Clip Vertical (open O clip) (part 30241b) and Brick, Modified 1 x 1 with Clip Vertical (part 30241)