STV ranks candidates numerically in the voter's order of preference, while FPP allows voters to tick the box of the person or persons they want to vote for.
Some councillors argued the mixture of voting systems on voting documents confused voters which led to mistakes being made on voting forms.
This was backed up by the council's electoral officer, Warwick Lampp, who said the numbers of incorrectly filled in STV votes rose to between 8 and 9 per cent when the option appeared on voting forms along with the FPP system.
However, he said the numbers of incorrect forms dropped to between 1 and 2 per cent when the same voting system was used for all elections.
Councillor Karen Hunt said STV was a fairer system and, in her opinion, resulted in better representation across the board.
She also said the FPP system favoured incumbent elected members.
But, councillor Rob Kent argued there was no evidence to suggest STV was in any way better, fairer or easier to understand than the FPP system.