400 M3 after flight amateurs and PRO will be the straightest medium distance disc. Useful for players of all levels. For beginners, the straightest will be M4 . With the M3 you will hit all the straightest lines, even when it seems that you can't throw through. With PRO power, the M3 will hold any line, for beginners the M3 will turn flat at the very end of the flight.
