Which data source is more accurate

[Reuben Stewart]

Ive gathered alot of list over time from all different sources, county records, court records, 3 rd party vendors, like list source, or mellissa data etc.

Usually I edit them in excell and get them ready to be mailed. Just for my own satisfaction i started to compare owners names and mailing address across different databases and i find different info across several of them. Would you say county information is more accurate as far as mailing address and owners names or are 3rd party vendors faster with updating data?