yogya jodi is unmarried couple whereas fav jodi is for married couples
i got this info from the rules and regulations section on the voting page at indya.com
2. On Air Promos shall be telecast on the Channel wherein each viewer(s) will be asked to vote for one of their favorite
i) Elder i.e. Buzurg and/or
ii) Child i.e. Chhota Bachcha and/or
iii) Newcomer (Female) and/or
iv) Newcomer (Male) and/or
v) Mother i.e. Maa and/or
vi) Father i.e. Pita and/or
vii) Daughter i.e. Beti
viii) Son i.e. Beta and/or
ix) Brother i.e. Bhai and/or
x) Sister i.e. Behen and/or
xi) Sister in law i.e. Bhabhi and/or
xii) Younger Brother in law (husband's younger brother) i.e. Devar
xiii) Wife of younger Brother in Law (husband's younger brother) i.e. Devrani and/or
xiv) Wife of elder Brother in Law (husband's elder brother) i.e. Jethani and/or
xv) Husband i.e. Pati and/or
xvi) Wife i.e. Patni (wife) and/or
xvii) Mistress i.e. Saut and/or
xviii) Villain i.e. Khalnayak and/or
xix) Father in Law i.e. Sasur and/or
xx) Mother in Law i.e. Saas and/or
xxi) Daughter in Law i.e. Bahu and/or
xxii) unmarried couple i.e. Yogya Jodi and/or
xxiii) Couple i.e. Jodi ("Categories").