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OSB is a lot stronger. Particle board is a lot smoother. Which one is better depends on what you plan to do with it. If it will be structural I suggest OSB or plywood. Particle board is generally crappy. Views Â· View Upvotes.
Are you sure this is not OSB? If the OSB is advantec or similar tile can be set on it after installing 1/4 cement backer board over the OSB. If it is particle board replace it with exterior grade 3/4 plywood for the tile and 3/4 plywood for the flooring. Axhammer.