dear friend
donot panic
between various effect one thing is common that all of these explain the stability of the compound.one thing keep in mind that if on comapring the stability more than one factor is favouring the compound then it will be more stable.
but mesomeric effect generally predominates over inductive effect except fluorine.as inductive is a short range ans mesomeric is a long range favoring stability provided conjugation is there.
thanks and regards
sunil kr
askIItian faculty