The spear was used by armies around the world in ancient times. All cultures were proficient in using the spear for combat and for hunting. The Greeks and Roman’s used it, the Chinese army used it, the Native Americans used it, native Africans used it etc. The spear is a part of every Chinese martial art including Tai Chi.
Typically Wing Chun uses the long heavy pole since it is thought that some of the Wing Chun developed along the rivers of China as the Chinese Opera people went from city to city using the long poles to push the boats. Naturally it was also used as a weapon.
Western fencing and the long pole and the spear have many techniques in common. The very basic technique are the Tan, Bong, Fook and Gan techniques. Probably the Wing Chun hand actions come from the use of the spear since that is what the army fought with in historical times.
The long pole is good for developing some upper body strength such as increasing punching power. The spear is more practical for fighting since it is quicker to maneuver around. For ladies and smaller people, the spear is a more appropriate weapon. The ideas used for this weapon can easily be translated to common implements such as a garden rake.
At our club we use both the spear and the long pole. Our form is extremely simple and just consists of 26 movements. The main movements are the Tan, Bong, Fook and the poke. The spear also uses the Huen or circling movement, the Lan or bar movements, the Jut or jerking movement. the Jum or sinking movement etc.