Why is Blade Bulldozer Better?

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The replies all hit the nail on the head, but let me try to give a graphic description -- hold your right hand so that your palm faces the tabletop and the fingers point away from you. A 6-way blade (also known as a PAT -- Power, Angle, Tilt -- blade) can move in all the directions you can move your hand. If the tips of your are the blade, then the PAT blade can move up/down (moving your hand toward or away from the table top), left/right (keeping your hand parallel to the table, rotating your wrist so that either your thumb or pinky comes toward you), and tilt (tilting your hand so that either the thumb or pinky gets closer to the table surface).

The 4-way blade (dozers with push arms, the long, metal beams that run parallel to the tracks) usually doesn't have angling capabilities.

Smaller tractors are usually equipped with PATs (specifically, VPATS, or Variable PAT, which allows you to manually adjust the angle the cutting edge makes with the ground) because they are designed to do finish grading and other precise manuevers.

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