In which form shd the birthchart be casted??

i am a south indian . i want to know in which form one's horoscope shd be calculated- whether in thrik panchagam or vaikya panchagam. if any diff is there in planetary positions between the 2 , which shd one take for all consultations. can the birthchart for this person be casted and can experienced astrologers cast life on the marriage life. details are 24.09.1975-8.30pm -chennai