Hi Shinlee,
You asked:
Does anyone here use a flicker jab and if so is it better to use then a normal jab?
I used it sparingly and, in my opinion, it is definitely not better to use than a "normal" jab in the overall scheme of things.

Generally speaking, I think the "flicker" jab has limited utility. It's two main purposes are 1) to irritate an opponent like a "fly in your face" to feel him out and/or keep him from setting up a "rhythm" against you (for this purpose I would rather use a "normal" jab) and 2) to lull an opponent to "sleep" with a fast, light punch TO SET UP and SHOCK HIM with, as part of the good 'ol "one-two" combination (i.e. left jab-straight right hand), a powerful, devastating straight right hand on the button.

Depending on your level of expertise and experience, if you're a newbie to the sport, I would concentrate and perfect the "normal" jab first and foremost before playing around with the "flicker" jab and other variants.

Take Care,
Lito