they dont do the same thing at all. U need to do some serious research bro. Not flaming u here just pointing out that u dont sound ready to me. Read up, define ur goals and plan from there. Then when ur ready i'd guess a test only cycle would suit ur needs best. If the 10 ml vial is 250mg/ml as u seem to imply that could do u for a first cycle assuming ur not massing 250lbs+
when mac reasonably points out that alternating compounds would get ur bloodlevels all over the place this means great probability of very unpleasant sideeffects and probably not very good results.
In short: read read read!