If the H1B lottery is picked up; Is it advisable to go for the Counsalar process instead of the COS(Change of Status).

You can go for counselor Processing or change of status, it depends on whether you want to change your status automatically to H -1 on October 1 or later whenever the H-1 gets approved or you want to leave the country get a H1 visa stamped and then return on a H -1