question about protein bars and p90x.....?

so i do p90x and i was wondering when is best to eat the protein bar. i usually eat it about 20 minutes before my orkout and drink the recovery drink afterwards. but i see every where that its best to eat the protein bar after the workout. my question is should i be eating the protein bar and drinking the recovery drink after my workout. or is it okay to eat a protein bar before the workout. pros and cons of eating the bar before or after the workout. any insight is great thanks