the glitchbuster type is what plugs into your receiver , it stores/smoothes out energy at the receiver to help from "glitches" caused by low power and/or spikes. the caps that are found built into the esc or wired onto the esc at the battery posts of the esc smooth out frequency ripples - kinda basically the same thing as the glitch buster on the receiver but different. yes i only know enough to be mildly dangerous. i run both , and i do honestly know from my own use that a glitch buster helped on my receiver to cure a random split second weirdness in my sct's handling. ive read on here to always run caps on the esc if the esc came with them new. ive also read about good results of others adding additional caps.