A LORTAB is basically
Vicodin (hyddrocodone), whereas a
PERCOCET is a more natural opiate, also called oxycodone. Because oxy is less synthetic, it tends to be a bit stronger. Both meds contain the opiate (either hydro or oxy) and acetaminophen (tylenol).
Both are habit forming when used improperly, or for long periods of time.
Hope that helps.