If your property has a clay sewer line we always advise to replace the entire sewer line with extra heavy cast iron pipe. A clay sewer line is more susceptible to experiencing a secondary issue as opposed to a cast iron sewer line, where a repair may make more sense. If you decide to make a repair on a section of your clay pipe, there is a possibility that you will have to repair another section of the old clay pipe in the near future. Having a sewer contractor perform multiple repairs on your clay pipe at different points in time can become quite expensive.
If you currently have cast iron sewer pipe, it may make more sense to entertain the idea of a repair as most cast iron pipes should last you 50+ years if installed by an experienced contractor, with the proper materials. Either way, you should always have a detailed inspection performed on your sewer line to allow for a proper assessment and the most cost-effective way to relieve your issues.