Was this a popular light tank?, Where was it used?, Mor popoular than the stewart? or did they play different roles?

They were uised at differnt times. If this had been introduced during WWII, it would have likely beenclassified a medium tank. It came into service too late for use in Korea and was out of front line US service by the time of the buildup in Vietnam. Sqaudron's Armor ini Vietnam shows a ARVN M41 with a field applied mesh guard around the turret to protect it against RPG's.
http://www.ftmeade.army.mil/Museum/Exhibit_M41_Tank_%20Info.htm " TARGET="_blank"> http://www.ftmeade.army.mil/Museum/Exhibit_M41_Tank_%20Info.htm
http://www.jed.simonides.org/tanks/whiskey/walker-bulldog_series/m41-series.html " TARGET="_blank"> http://www.jed.simonides.org/tanks/whiskey/walker-bulldog_series/m41-series.html
http://www.michiganhistorymagazine.com/extra/tanks/m41.html
http://tankguy.gooside.com/History/History02.html " TARGET="_blank"> http://tankguy.gooside.com/History/History02.html

Also by Nationalist Chinese in Taiwan. My dad actually commanded a regiment of them, and there are still upgunned version of the M41 served in ROC Marines if I remember correctly.

The light tank concept fell out of favor around the time the Bulldog hit the street. Here is a link to who has imported the Bulldog: http://www.fas.org/man/dod-101/sys/land/m41.htm. When it came into being, the average infantryman had a really effective one man anti-tank weapon. They had RPGs (rocket propelled grenade) or LAWs (light anti-tank weapon) and the light tanks just did not have enough armor to survive encounters.

They were popular with countries with minor armies due to the fact that they were not too big, fairly reliable, and had a decent gun to deal wth the types of threats these countries faced.

When the Stuart was developed, most of the armies of the world were still mainly foot armies. It was designed to go up against infantry and had no anti-tank capabilities. It was originally equipped with five .30 caliber machine guns and a 37mm main gun. Again, very sufficient fire power to deal with WW1 style infantry charges.

The Walker Bulldog, on the other hand, was designed to scout out advancing enemy armor formations. The 76mm high velocity main gun was strong enough to destroy most Soviet armor that would be found in the advance guard of an attacking force. It was the first production US tank not to carry the hull mounted machine gun in its basic configuration.

The Bulldog's replacement, the T-92 airborne light tank, was canecelled when the amphibious PT-76 showed up on the battlefield. The resulting M551 Sheridan eventually replaced the Bulldog in US Army service. The Sheridan was our last light tank to see service, and it wasn't even a true light tank.