ABS is a level up because it curls like mad off the print bed because of internal stresses, and this will cause prints to fail if you do not have a heated chamber, which is a bit of a challenge to set up over Ender 3 like printers. PETG meanwhile likes to be dehumidified under heat first to avoid excessive stringing, which requires a separate doodad, and it likes all metal hotends that do not include the usual internal PTFE tube, which off-gasses nasty stuff if heated above roughly 250°C. PLA has none of these problems. "Level up" is about printability, not material characteristics of the end product.