Losartan, without question.
Ask your doctor if there is the potential of them adjusting one of the medications to compensate for the other if this is necessary and if this can be done. Also look into means of assistance for prescription coverage. There is the Patient Assistance Program where the pharmaceutical company that produces the medication can provide free coverage if a person falls between the gaps in insurance coverage and meets certain eligibility criteria. See if your medications can be covered in that way. Also there are other forms of assistance as well.