Don't conclude just based on the brokerage. Pl. add up the turnover charges or transaction charges (+STT+Stamp duty + whatever) and compare end figures instead of just brokerage.
If I charge you 40rs for one buy+sell trade worth 1 crore and take 200rs extra on turnover charges, you are effectively paying me 240rs as profit (as brokerage in total). I hope you are mindful of that