the grass is always greener on the other sideThe circumstances of others seem more desirable than one's own but in reality often are not.
the grass is always greener on the other side of the fenceAlternative form of the grass is always greener on the other side.
greener pasturesAny place or condition that is more favorable or beneficial.He worked there for two years before leaving for greener pastures.
the grass is always greener on the other side of the roadAlternative form of the grass is always greener on the other side.
i RegisterIn some senses, greener is marked as derogatory, slang. Watch for register when choosing this word.