forecasting models

we are thinking of using the auto model procedure 1 as the approach that we would be following as the initial forecasting strategy for the selection ids when we go live. auto model procedure 2 is more accurate then the procedure 1. would it be a good idea to use the 56 strategy rather then the (50 or 53) strategy. If some one can explain the pros and cons of the two in go live.

Thanks in advance