As the name suggested rigorous distillation column does rigorous calculations to try to reach as accurate results as the real life distillation column(It does flash calculations for all individual trays). Shortcut column provides good guess value for number of stages, reflux ratio and feed stage value for product composition you want. If you want to do it directly you can do, but it is very difficult to guess proper values for these by trial and error. If you use wrong values system may never converge to a solution or give solution which have no physical significance. 

Thanks,now I got it.