stripes normally look like stripes, not much else can be said.
your asking an unanswerable question,
most common stripe sold? depends on where you live.
in pet stores, most likely it is a normal stripe but occasionally even stores get in different morphs.
all snakes are different in shades, pattern etc, striped is no different, some have full striping along their whole body, others have breaks in the stripes, or they fade out(vanashing).
just look up striped corns to see the amount of variation in colors and shades.
and please stop being rude and demanding answers when you can search and look at pictures to see for yourself.