What is more beneficial?

Dear Experts,

                       What will be more profitable for a firm,gst regular scheme or composition,

Firm 

purchases from supplier Mrp Rs 1000 product at

Less 40 percent discount on mrp gross amount rs 600

plus gst18  rs 108

total cost of purchase rs708

if product sold by firm is  done at mrp1000 inclusive to customer 

the firm will make more profit in gst regular  scheme or in composition scheme?