Depends on how close you get. It gets even better if you can use the Anti-Aircraft Quirk with it, too. Of course, Inner Sphere Pulse needs to get REALLY close, while Clan ER Pulse will have the best advantage out the set.
Still, LB-X is considered the master due to the number of hits it can create, as well as having a range advantage (in most cases). Those hits can tear Combat Vehicles apart with Crits (barring having Ferro-Lamellor Armor, of course).