Buddhist will be the most expensive if the monks charge at higher fee.
I was charged S$6,000 for the three nights chanting of sutra from 7.00pm to 9.00pm and the morning chanting for an hour for the funeral. Four monks were prsesented. Those paper house, ... extra.
Later, learnt from friend that Taoists charge the most $1,200.
That was 10+ years ago