Difference between rule 6(1) and 6(3)

Ram kr. (Buisness) (883 Points)

06 August 2016  
Dear Experts, What is the difference between Rule 6(1) and Rule 6(3) of cenvat credit rule 2004. Which rule is best for us if we are removing excisable goods and exempted services(Trading Goods) without keeping seperate record. Thanks